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What Are The Best AGM Battery On The Market In 2019 (Detailed Reviews)

When looking for a battery there are a lot of different types from AGM to flooded to gel. Well, this article isn’t going to get into the differences of those. If you want to know the differences, then we have some articles you can read.

Instead this article is going to look at the best AGM battery and help you figure out which one is right for you. After reading this article you will have a good idea of a few of the different AGM batteries on the market and know what to look for when choosing one.

PRODUCTDETAILS
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Odyssey PC680 Battery

  • Deep cycle battery and has a long service life
  • Powerful enough to start most smaller things, but this might not be enough to start bigger things
  • Recharges fast,it can recharge in four to six hours
CHECK ON AMAZON
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Mighty Max Battery ML35-12 - 12V 35AH U1 Deep Cycle AGM Solar Battery Replaces 33Ah, 34Ah, 36Ah brand product

  • It will fit into most things
  • High discharge rate, and deep discharge recovery
  • Can be used in a wide range of temperature conditions, so no matter if it is hot or cold
CHECK ON AMAZON
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Universal UB121000-45978 12v 100AH Deep Cycle AGM Battery 12V 24V 48V(Black)

  • The liquid is held in the glass matts, it will not come out and doesn’t need to be refilled.
  • It holds a charge well and can be recharged faster than other similar batteries
  • Excellent to use with trolling motors and any other equipment that requires consistent energy at a low cranking current
CHECK ON AMAZON
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Optima Batteries 8016-103 D34M BlueTop Starting and Deep Cycle Marine Battery

  • Shock resistance and being able to start things in any weather condition
  • Can be used for marine item and RVs in any situation
  • For those who need a sure-starting, strong-cranking, maintenance-free power source
CHECK ON AMAZON
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Optima Batteries 8040-218 D35 YellowTop Dual Purpose Battery

  • Reserve capacity of 98 minutes meaning that you can get a lot of top performance out of it
  • Designed to provide the extra performance and deep-cycling capability
  • It is capable of starting the vehicle, but then better at discharging so it keeps the vehicle running while powering all the other items
CHECK ON AMAZON
best agm battery

Which is the best agm battery?

Top 5 Best AGM Batteries On The Market:

These AGM batteries are all great options and are good starting points for you to figure out what you are looking for:

1

Mighty Max Battery ML35-12


Mighty Max Battery ML35-12

Mighty Max Battery ML35-12

The first battery we will look at is the Mighty Max ML35-12. It is a 12 volt, 35 Amp Hour, U1, deep cycle battery. The size of this battery is 7.68 inches x 5.16 inches x 7.13 inches. 

This makes it pretty standard size and means that it will fit into most things. It weights 23.15 pounds and it has the positive terminal on the left side.

This battery is great because it can be mounted in any position, has a high discharge rate, and deep discharge recovery meaning that it will last for a long time. It can be recharged over and over and has a long service life. 

On top of this it can be used in a wide range of temperature conditions, so no matter if it is hot or cold, it will operate and provide charge properly. The case is made to resist shocks and vibrations, so you don’t have to worry about it cracking or getting damaged either.

The only issues people have had with this battery is some people have gotten bad ones that didn’t last very long. This was an issue with manufacturing and wasn’t many users.

The good thing though is that this battery has a one year warranty, so if you end up getting a bad one, they will replace it for you. This isn’t likely though, as most of the issues have been resolved, but it is still nice that it has a one year warranty.

Mighty Max SLA batteries are utilized in a wide variety of applications including: Consumer Electronics, Electric Vehicles, Engine Starters, Golf Carts, Hunting, Lawn and Garden Tools, Medical Mobility, Motorcycles, Power sports, Portable Tools, Solar, Toys and Hobby, Access Control Devices, Emergency Lighting, Security and more.

Bonus: If you want to have a smart charger for fully charged battery, this is the best battery maintainer for your car battery.

2

Odyssey PC680


Odyssey PC680

Odyssey PC680

The next battery we will look at is the Odyssey PC680 Battery. It weights 13.4 pounds and measures 7.7 inches x 7.7 inches x 3.9 inches. This makes it a standard size battery. The positive terminal on this battery is on the right side.

This battery is another deep cycle battery and has a long service life. It last 70 percent longer than most other deep cycle batteries and can last up to 400 cycles discharging up to 80 percent. This means that you will be able to use this battery for a long time after getting it.

It comes with a full 2 year warranty and Odyssey will replace it for you if you have gotten damaged one, but you have to go thru their customer service and not the customer service of where you bought the battery from. Outside of this though the service life on this battery is 3-10 years.

The battery has 170 cold cranking amps, which means that it is powerful enough to start most smaller things, but this might not be enough to start bigger things. Before getting this battery be sure to check the CCA of the old battery to make sure that this one will be able to provide enough power.

This battery also recharges fast. Deepening on how low it is it can recharge in four to six hours, which is faster than most batteries on the market. These positive things make the Odyssey PC680 a good AGM battery to consider.

The ODYSSEY battery is the ideal choice for a complete range of powersports applications: motorcycles, ATVs, personal watercraft, snowmobiles, ultralight aircraft and Gyrocopter aircraft.

3

Kinetik HC600


Kinetik HC600

Kinetik HC6001

Another top AGM battery you can consider is the HC600 from Kinetik. This battery is standard size and measures 7 inches x 3 inches x 6.5 inches and weighs 11.8 pounds. This means it will fit into most things and can be used in anything that it will fit.

The positive terminal is on the right side, but since it is an AGM battery, it can be installed in any position you need too. The case on this battery is durable and made from ABS plastic. This means it can resist extreme heat conditions and vibrations. It is also spill-proof and sealed tight no matter what bumps you might hit.

The Kinetik HC600 is a standard 12-volt battery, but it provides a high current. This means you can use it to run a vehicle or something else such as a sound system.

The battery offers ultra-low ESR and has more plates to provide stronger energy density. This gives a robust 600 cranking amps and also an 18 amp hour rating. That means this battery can go for a while and can power anything up to 600 watts without issue.

Users really love this battery and how well it holds a charge. It stores energy to a high level, so you don’t need a capacitor if you are using it as a second battery.

Most users have used these to power their sound system and have pushed things even higher than the rating with the Kinetik HC600, but it can be used as an excellent car battery as well.

It also has a one year warranty to give to peace of mind. Some people have even used this battery as a mower battery and didn’t even need a jump after winter without charging it. If you are looking for a top AGM battery, then you should defiantly consider the HC600 from Kinetik.

4

Universal UB121000-45978 12v 100AH


Universal UB121000-45978 12v 100AH Deep Cycle AGM Battery

Universal UB121000-45978 12v 100AH Deep Cycle AGM Battery

Another top battery is the Universal UB121000-45978. This battery is big size and weights 60 pounds making it a large battery. The weight is due to the top build construction. The case on this battery is very durable and hard to damage. The battery is also shock and vibration resistant.

The UB121000-45978 is an SLA/AGM battery which means that it is spill proof as well as maintenance free. Since the liquid is held in the glass matts, it will not come out and doesn’t need to be refilled.

Users though of this battery have found that it holds a charge well and can be recharged faster than other similar batteries to get good results. It has a standing self-discharge of less than three percent per month, making it a very efficient store of energy that doesn’t require frequent charging.

This model has a 100AH rating guaranteeing an excellent storage capacity and functional lifespan for use with trolling motors and any other equipment that requires consistent energy at a low cranking current.

The battery is 12-volt which makes it great for any car or another piece of equipment that takes that voltage. This battery has left side positive when holding the battery towards you.

Another benefit to this battery is that it can be mounted in any direction since it is spill proof, so if you are having a hard time reaching a cable to it, you can install it is a different way to get more reach.

Outside of the extended durability of this battery users also like that the Universal UB121000-45978 comes with a one year warranty. This is nice because some users have had it short-out a little into having it and they were able to get a new one.

This battery is an excellent 12-volt battery that holds a charge well. It also has solid durability, and the customer service and warranty is a bonus. You should defiantly consider the Universal UB121000-45978 if you are looking for a new battery for a car or other equipment.

5

Optima Batteries 8025-160 25 RedTop


Optima Batteries 8025-160 25 RedTop

Optima Batteries 8025-160 25 RedTop

Next we get to the first Optima battery and it is the 8025-160 Red Top. This battery measures 9.3 inches x 6.8 inches x 7.6 inches making it standard and it weights 39.5 pounds making it a bit on the heavy side.

This battery is 44 amp hour and offers 720 cold cranking amps (CCA) meaning that it can start anything with no problem. It has a reserve capacity of 90 minutes and the positive terminal is on the left side.

This AGM battery is designed to start things in any weather conditions, and can be mounted in any position needed. It is 15 times more resistant to vibration compare to other batteries on the market meaning that the case will not get damaged and cracked. It means that this AGM battery can be used on race cars that run at high speeds.

The red top is designed for things with alternators that instantly start giving power to the battery once started. Since the Optima Red Top gives so much power at the start, it needs to start receiving a charge quickly to operate properly.

 The 8025-160 Red Top is ideal for trucks, SUVs, hot rods, street cars and other applications that require a spillproof starting battery. It can be started in very low temperatures during winter. The Red Top is also designed to be low maintenance so that you’ll have less to worry about.

6

Optima Batteries 8016-103 D34M BlueTop


Optima Batteries 8016-103 D34M BlueTop

Optima Batteries 8016-103 D34M BlueTop

Next in the Optima family is the 8016-103 Blue Top. This one measures 10 inches x 6.9 inches x 7.8 inches and weights 43.5 pounds making it a heavy battery. It offers 55 amp hours of power and has a cold cranking amp of 750 meaning that it can start anything and can keep it running for awhile.

The blue top has all the same qualities as the red top when it comes to shock resistance and being able to start things in any weather condition. The reserve capacity is 120 minutes meaning that it can keep running for awhile.

The blue top however is design for a few different things. The blue top with dark gray case is designed to be a starting battery only and never for a cycling battery. It should be used for marine applications and RVs only when starting is required.

They have a blue top with light gray case though that is designed to both start and deep cycle. The light gray blue top can be used for marine item and RVs in any situation. Just make sure you get the right one for your situation and be aware of these differences.

 This battery is ideal for those who need a sure-starting, strong-cranking, maintenance-free power source.

7

Optima Batteries 8040-218 D35 YellowTop


Optima Batteries 8040-218 D35 YellowTop

Optima Batteries 8040-218 D35 YellowTop

The last Optima battery we will look at is the 8040-218 Yellow Top. It measures 9.4 inches x 6.8 inches x 7.7 inches and weights 36.4 pounds putting it on the smaller side for an optima battery.

It has a reserve capacity of 98 minutes meaning that you can get a lot of top performance out of it. The positive terminal is on the right and it has 620 cold cranking amps meaning that it is more than strong enough to start things in pretty much any situation.

The Yellow Top is designed in the same way as the other two to be able to start things in any weather condition and to resist vibrations and mounted in any way. The thing that sets the yellow top apart is that it is designed to provide the extra performance and deep-cycling capability, it's used in instance where you have a lot of accessories.

If you have power sliding doors or dvd players and things that draw a lot of power while running, then this is the option for you. It is capable of starting the vehicle, but then better at discharging so it keeps the vehicle running while powering all the other items.

It can be used on any type of vehicle from your standard car to racing vehicles or vehicles with a lot of aftermarket electronics.

Optima Design

So what sets the three Optima batteries apart from other AGM batteries? Well, that has to do with the design. It doesn’t matter what color top Optima battery you have they are all made the same way. Inside the Optima batteries the plates are wrapped in coils.

These coils give more surface area and allow them to discharge better as well as recharge better. This advanced design is what gives them superior performance compared to other AGM batteries and why users love them.

What is an AGM Battery?

If you won't have a better understanding of AGM battery, we will briefly cover what an AGM battery is. AGM stands for Absorb Glass Matt and means that the liquid that holds the charge in the battery is held in a glass matt.

These matts are between the plates in the battery and suspense the liquid between the plates. This has a lot of benefits, but is too much to go into detail here in this article. Knowing the basics thought of an AGM battery is important to help you find the best AGM Battery.

Recommendation

So, which one of these AGM batteries is the best? Well, the answer is one of the Optima ones depending on your need. If you just need a good starter battery for your car, then the red top will do the job great.

If you have a lot of after market things on your car, then you would want the yellow top. If you are looking for a battery for an RV or something else, then the blue top Optima should serve your needs.

One of the Optimas is the best though because they are powerful AGM batteries and will last for a long time. But they are more expensive than others.

None of the options on this list are bad though, Mighty Max Battery ML35-12, Kinetik HC600, Odyssey PC680 and Universal Ub121000-45978 are good depending on what you need, so if you think one of them would work better for you, then it is safe to go with one of the others.

Conclusion


So now you know seven of the best AGM batteries on the market. The thing to remember when buying a battery is the side the positive terminal is on that you need and also the cold cranking amps and amp hours.

These should be equal to or greater than the battery you are replacing to make sure that it has enough juice to do what you need it to do. All these AGM batteries are good and one of them should get the job done for you.

Agm vs Gel Battery: What Are The Differences?

There are a variety of subcategories when it comes to lead acid batteries. This article will look at two of those. We will discuss a gel cell and an AGM battery. The third type that we will not cover here is the flooded or wet cell battery.

Once you are done reading this you will know the difference between AGM vs Gel battery and know which one is a better option for you.

AGM vs Gel battery

What are the differences between AGM vs Gel battery?

Battery Basics

Before you can understand AGM vs Gel battery you have to know the basics of a lead acid battery. Once you know how a lead acid battery works you can more easily see the difference between the two sub types that we are covering here.

Inside a lead acid battery there are three main things. Those things are sulfuric acid, metal plates, and water. The sulfuric acid is normally 35% and the water is 65% and this mixture makes a fluid called electrolyte.

This electrolyte is what produces the electrons that produce the charge. The metal plates are what the electrons pass thru to discharge from the battery and give off the charge. You can use best battery tender to recharge your battery car.

Between these plates it deepens on the type of subcategory the battery is and that is where the main difference between them come in. This is a simple explanation, but is good enough for here.

Gel Cell Battery

In a gel cell battery the electrolyte is suspended in a silica gel. This gel is a thick paste that allows the electrons to flow thru it, but it will not spill if broken. This is one of the big benefits to a gel cell battery.

Gel battery

A Gel battery

Pros of Gel Cell Battery

Outside of the fact that it does not spill if broken, it also doesn’t require any special maintenance outside of charging. The charging has to be done to break the sulfur off of the plates.

They also are good because they have slow discharge rates. This means that they can be used to provide a charge for a long time.

They can also be installed in any position since they don’t leak, they have no fumes, they are vibration resistant, and they have very little risk.

Cons of Gel Cell Battery

The downside to the gel cell is that it requires special charging. You don’t want to over or under charge it, and you need a special charger that is designed for a gel cell battery.

If you use the wrong charger or don’t charge it properly, then it can really impact the life of the battery. This is bad because gel cell batteries can be pretty costly.

Another thing that is bad about gel cell batteries is that they can be heavy. The gel adds a lot of weight and it can be hard to find the capacity in the size you need. This challenge of being able to find the one you need makes them impractical sometimes.

One last downside to gel cell batteries is controlling the temperature of them. They can get warm when discharging and charging. This means you got to be careful with them because they might bust or catch on fire if they get too hot.

AGM Battery

Now we will look at what is inside  of an AGM Battery separating the plates. Separating the plates in an AGM battery are thin glass matts. AGM stands for absorbed glass matts, so the glass matts is how the battery gets its name. I also have article What Is An Agm Battery , you should take a look at it.

The matts between the plates is what contains the electrolyte liquid and they are only wet enough to hold the proper amount of liquid. This makes AGM batteries light.

AGM battery

A AGM battery

Pros AGM Battery

On top of being light they are also safe. Since the matts are wet only to the point of being able to hold the liquid, you don’t have to worry about spills and you don’t have to refill them.

The only maintenance that has to be done to them is recharging. Recharging helps break the sulfur off the plates so the electrons are back in the liquid and can flow thru the battery.

However, unlike other kinds of lead acid batteries, AGM batteries can go longer without having to be recharged. The reason they can go longer between charging is the sulfer doesn’t build up on the plates as much.

This is thanks to the fact that the liquid is held in the glass matts and the matts do a good job of keeping the liquid coming into direct touch of the plates.

The fiberglass suspending the liquid also makes it so they have low resistance which means that the electrons can flow easier. This means they can be good starting batteries, but also good running batteries since they don’t need charged as often.

Cons of AGM Battery

One downside  of AGM batteries though is the cost. They can cost more than other types, but they also tend to last longer to help off set this. Also, since we are getting better at making them, it is helping bring the cost down.

One other negative about AGM batteries is you have to be careful charging them. They can be sensitive when charging and can easily be over charged or undercharged.

You should not discharge an AGM battery below 50% because this can cause it to not be able to charge all the way back up to full strength.  You don’t want to undercharge the battery because that can effect its life, but you also don’t want to overcharge them either. Overcharging can cause the battery to not last as long either.

When to use

Both types of batteries have their place and can be good. AGM batteries hold a charge better and are safer since just the right amount of liquid is held in suspension in the fiberglass and it isn’t just floating around inside.

Even though gel cell batteries don’t leak per say, the paste still can come out of them. Gel cell batteries though are good because they can be used in any position so if you need to stick one in an acquired spot, then you can. Charging them can be a challenge though and you have to be careful with that.

Since gel cells can be hard to charge and also hard to find the right capacity sometimes, they are being phased out a lot by AGM batteries. Pretty much all the benefits that a gel cell battery had can be obtained with an AGM battery.

This means that more and more often you will probably have the option to buy an AGM battery over a gel cell battery and eventually gel cell batteries will probably be off the market completely.

Conclusion

So now you have a better understanding of what a gel cell battery is and what an AGM Battery is. You should understand how both types work now and what makes them different from each other.

If you want to learn more about the third type of battery which is flooded battery, then we have articles for that and if you want a more in-depth understanding and uses of AGM batteries, then we have an article explaining that as well, so you can learn as much as you want about the different types of lead acid batteries and what makes them different from each other.

AGM vs Flooded Battery: What Are The Differences?

There are a variety of subcategories when it comes to lead acid batteries. This article will look at two of those. We will discuss a flooded battery and an AGM battery. The third type that we will not cover here is the gel cell battery.

Once you are done reading this you will know the difference between a flooded battery and an AGM battery and know which one is a better option for you.

AGM vs Flooded battery

What are the differences between AGM vs Flooded battery

Battery Basics

Before getting into a flooded battery vs an AGM battery we will give a brief explanation of how a lead acid battery works. Knowing this is important to understand fully the differences between an AGM battery and a flooded battery.

A lead acid battery is made up of three main things. Those things are sulfuric acid, metal plates, and water. The sulfuric acid is normally 35% and the water is 65% and this mixture makes a fluid called electrolyte.

This electrolyte is what produces the electrons that produce the charge. The metal plates are what the electrons pass thru to discharge from the battery and give off the charge. This is a simple explanation, but is good enough for here.

Every one using battery also need the best battery tender to maintain it, you should have one to extend battery life

Flooded Battery

The flooded battery is also known as the wet cell battery and it is the most simplest battery available. These batteries resemble the earliest batteries most closely.

Between each plate is called a cell and in a wet cell battery the electrolyte mixture is just held between the plates in a liquid form. Since the battery is full of liquid it makes them heavy

A Flooded battery

A Flooded battery

Pros of Flooded Battery

The good thing about a flooded battery is that they are simple, and that makes them cheap.  The affordability is one of the biggest reasons why they are so popular.

Another reason that wet cell batteries are good is that they come in the biggest variety of sizes. This means no matter what you are needing a battery for, there should be a wet cell one that works for your needs.

This is another reason why some people use them because they might not be able to find another type of battery is the capacity or size they need.

Cons of Flooded Battery

The downside to flooded batteries though is that they require a lot of work to maintain. Since they are filled with liquid, the liquid can evaporate or freeze.

This means that every so often you have to check to make sure that the right volume of liquid is inside of it. If it is too low, then you have to add water. This loss of liquid can also affect the charge of the battery.

Another downside to wet cell batteries is that they can be dangerous. The acid inside of the battery is very corrosive and bad for you to touch or for it to get on things. If the shell of the battery cracks or the liquid comes out, then it can cause damage to other things.

Wet cell batteries are also the most common to have exploding issues. This is because if you over fill them, then they can bust especially when they get warm because the liquid inside will expand. This can make them dangerous. However, if cared for properly and maintain well, they can last for a long time.

AGM Battery

Now we will cover the basics of an AGM Battery. In an AGM battery between the plates are thin glass matts. That is because AGM stands for absorbed glass matts.

These matts is what holds the electrolyte liquid and they are only wet enough to hold the proper amount of liquid. This makes AGM batteries light.

AGM battery

A AGM battery

Pros AGM Battery

Outside of being light they are also safe. You don’t have to worry about the liquid spilling out and the only maintenance that has to be done on them is recharging to break the sulfur off the plates.

They can go longer without having to be recharged to since the liquid isn’t being held on the plates. The fiberglass suspended the liquid making them have low resistance as well, so they can be used for anything.

Cons of AGM Battery

The downside to AGM batteries is that they cost more than other types. This is offset some though because of how long they last. Another negative about AGM batteries is that they can be sensitive when charging.

They should not be discharged below 50% and when charging you want to make sure you don’t undercharge them, but you don’t want to overcharge them either. These things can really affect the battery life.

When to use

So when should you use each one? Well, flooded batteries are good for backup batteries, utilities, and grid power. While AGM batteries can be used every including off grid power systems and even vehicles.

Both types of batteries have their place and can be good. AGM batteries hold a charge better and are safer since just the right amount of liquid is held in suspension in the fiberglass and it isn’t just floating around inside.

Wet cell batteries though are very versatile and are cost effective if you need a lot of batteries. Flooded batteries can last a long time to with proper maintenance and care.

Conclusion

So now you have a better understanding of what a flooded battery is and what an AGM Battery is. You should understand how both types work now and what makes them different from each other.

If you want to learn more about the third type of battery which is Gel, then we have articles for that and if you want a more in-depth understanding and uses of AGM batteries, then we have an article explaining that as well, so you can learn as much as you want about the different types of lead acid batteries and what makes them different from each other.

Read more:

What Is An Agm Battery And Who Should You It

There are all kinds of batteries available on the market. This can make it really confusing when shopping for a new one for your car, mower, or anything else that uses one. You might see batteries called AGM, Flooded, or Gel and not know the difference.

Well, this article is going to focus on what an AGM battery is. It will go in-depth explaining how an AGM battery works and also the uses for one. Once you are done reading you will have a better understanding of what an AGM battery is and if you should buy one for what you need.

What is an agm battery

What is an agm battery?

Lead Acid Battery

All the types of batteries that we have mentioned are lead acid batteries. This means that they work in relatively the same way. In a lead acid battery you have plates, lead, and lead oxide along with some other elements to change things such as density and hardness.

Inside the battery is a liquid solution that is 35% sulfuric acid and 65% water. This mixture is called electrolyte and it produces a chemical reaction that creates electrons. These electrons are how the battery provides power.

When you measure the charge of the battery you are seeing how much sulfuric acid is left in the water mixture. If it is low then that means that the acid is resting on the plates.

When you charge the battery it breaks the acid off the plates and causes it to return to the solution. This is what gives the battery its charge back.

Two Types of Batteries

There are actually two types of lead acid batteries and the mentioned categories are sub types. The type of battery affects the sub type some, so that is why I am going to give a brief explanation here. You have starting batteries and deep cycle batteries. They are both designed to do two different things.

The starting battery is designed to give a short but strong charge to help start something. To get an engine to turn over it takes a lot of power all at once.

The way that cranking or starting batteries accomplish this is by having more plates inside them. The plates are what the charge passes thru and helps strengthen the charge.

Deep cycle batteries on the other hand are designed to stay charged longer and distribute a weaker charge but for a longer period. These are the ones that recharge better because how they are designed.

On a deep cycle battery there are not as many plates, but the plates inside of the battery are thicker. By being thicker it takes the electrons longer to travel thru them making the charge last longer, but not be all at once.

What Is An Agm Battery?

agm battery

A agm battery

Now we can get into what an AGM battery actually is. AGM stands for Absorbed Glass Matt. They have thin glass mats inside of them that suspense the electrolyte close to the plates. The mats are only wet enough to hold the liquid, but there is not excess liquid inside.

This makes them spill proof and safe. Since the electrolyte is held close to the plates it helps with faster discharge and recharge. This means that since they can deliver a fast charge if need, then they can be used as starter batteries, but since they hold a charge good as well, then they can be deep cycle batteries.

AGM batteries are also easy to take care of. You don’t have to do anything special to them. If they are not going to be used for a while, then it is a good idea to put them on a charger, but they don’t have to have any other maintenance done to them. You have to have top rated battery tender for maintain other kind of battery.

Also, since they are only filled with enough liquid to wet the mats inside, they weigh less than most other battery. Another positive of AGM batteries is that they don’t build sulfur as much.

Sulfuretion is when the sulfuric acid bonds to the plates and comes out of the liquid. Since the sulfuric acid is held in the mats though it is not absorbed by the metal plates as bad.

Who is AGM Battery for

So what can AGM batteries be used for? Well, the answer is anything. It has already been mentioned that they last a long time and since they don’t have sulfur build up on the plates they make good deep cycle batteries.

For a AGM battery that is designed for that it will just have thicker plates than an AGM battery that is designed to be a starting battery. Since the AGM battery has low internal resistance though, it can be a good starting battery as well.

One that is designed for starting will just have multiple thinner plates inside of it and more matts to go between the plates.

AGM batteries are used in cars, motorcycles, boats, and most other things that require a battery. You can get them in most mid sizes and the typical size ranges from 30 amp hours to 100 amp hours.

This means that no matter what you need a battery for you can get an AGM one for it. AGM batteries do cost more than other types, but the extra cost is worth it.

what can AGM batteries be used for

What can AGM batteries be used for?

Conclusion

So now your battery knowledge is expanded and you should have a better understanding of what is an AGM battery  and how it works. You know that it stands for absorbed glass matt and that is because there are thin glass matts inside that hold the electrolyte.

You also now know what electrolyte is and how the two types of lead acid batteries differ. You know why AGM batteries are so good. If you want to learn more about flooded batteries or gel cell batteries and how they compare to AGM batteries, then we have articles about that as well.

Now, you should be able to know if an AGM battery is right for your needs and then go out and find one that works for you if it is.

How To Check Car Fuses With A Multimeter?

The electrical system in a car can be one of the most annoying systems to find the problem of something with.

Sometimes, however, the problems in the electrical system is something simple such as a bad battery or fuse. If it is a bad battery, try to use best battery tender to maintain it. It is a tool to recharge your battery.

In this article, we will teach you how to check a fuse to see if it is bad or not using a automotive multimeter.

This should be one of the first things you do if you are having issues with a specific area of your car because it is the easiest and a lot of times is the problem which will save you a headache if you just start there.

How To Check Car Fuses With A Multimeter

How to check car fuses with a multimeter?

What Is A Fuse

First, though before explaining how to test a fuse with a automotive multimeter we will cover what a fuse is. A fuse is simple a wire normally surrounded by some plastic that completes a circuit when plugged in. Most fusses have two prongs with a small wire running between them.

When the fuse is plugged into where it goes these prongs touch another piece of wire and complete the circuit. It is that simple. The thing is a fuse is designed to break through if something goes wrong. This is because when the fuse breaks or blows, it will protect the more expensive part of getting damaged.

A fuse blows when to much power runs thru it. This extra power causes the metal wire to burn up breaking the circuit. When the circuit breaks the extra power cannot get to the main part that can not handle the extra power. In cars, there are normally fuses in two spots. There is a fuse box under the hood with all kinds of fuses in it, and there is also sometimes some fuses under the dash on the passenger side.

Check car fuse

What is a fuse?

Knowing where your fuses are is important if you want to check them. Some of the fuses are a different color, and each color indicates how much power it can handle. The bigger fuses though are normally a dark gray though and not a color.

On the small fuses, you can normally see thru the colored plastic, and this allows you to see if it is blown or not without testing it. Also, blown fuses may have discoloration which is a sign that it is bad and needs to be replaced. The big fuses though you can not see the wire, however, so these you will have to test if you think something is wrong with it. Read on to learn how to do this.

How To Test Fuse

The first step before testing a fuse with a automotive multimeter is making sure that the car is off and the keys are not in the ignition. This will help keep you safe when pulling the fuse out and also protects the car. The next step is to locate the potential bad fuse. To do this, you go to the fuse box and look at the diagram or in the owners manual and find the one that corresponds to the system you are having trouble with.

For example, if your power door locks aren't working, then you will want to pull the fuse that goes with that. Then to pull the fuse, you do literally what it is called, and that is pulled straight up on the fuse. You want to make sure you pull straight up because you don't want the prongs getting bent or damaged as you pull the fuse out.

Test car fuse with multimeter

Test car fuse with multimeter

Once you got the fuse pulled you can visually inspect it. If it is a clear plastic you can try to see if the connection seems broken. If you can't see the wire through, then it is time to get the multimeter out. To use the multimeter you first have to turn it on and get the probes out. You then can set the multimeter to ohms.

This will measure the resistance of the fuse. You can then touch the probes together. This gives you a baseline reading and will tell you roughly the number you will get once you put the probes on the fuse. Once you have an idea of the reading, you should expect you can connect the probes to the fuse.

To do this, you just have to touch one probe to one prong and the other to the other prong. This will give you a reading. If the reading is close to what it was when the two probes touched, then the fuse is fine. If it does not give a reading, then that means the fuse is blown. This is because the current it is trying to send thru the fuse is not making it back thru.

To make sure the fuse is blown you can change the multimeter set to the setting to measure the current which is the arrow with a line. You can then touch the probes to the prongs on the fuse in the same way. If it beeps continuously, then the fuse is fine, but if it does not emit a sound, then the fuse is blown. Either test is a sufficient way to see if a fuse is blown.

What To Do

Replace car fuse

Replace car fuse

If the fuse is blown, then it is pretty simple to replace it. You just have to buy another fuse that is the same and plug it in (click here to check price at amazon). If the fuse is not blown, then you will have to dig deeper into your electrical problems which can be frustrating. That is why it is good to start with testing the fuse first because for most people it will only take a couple of minutes to test the fuse.

Another thing to remember if it isn't the first fuse that you test is to make sure to look at the diagram closely and that you test all the fuses that go to a particular system. Sometimes a system may have more than one fuse, so you need to make sure you test them all with the multimeter to rule out one being blown.

Conclusion

So now you know how to test a car fuse with a automotive multimeter. It is an easy task, and pretty much any multimeter can do it successfully. You can either use the resistance or ohm feature on your multimeter to check the fuse, or you can use the continuity setting to test the flow of current.

Either one will work and will give you a reliable reading on if the fuse is blown or not. Also, don't forget you can visually check the fuse to which might be able to save you more time in finding out if your car fuse is blown or not.

Top 5 Best Automotive Multimeters In 2019 (Detailed Reviews)

Multimeters are a handy tool around the house and in the garage. They can be used for a large variety of things, and are especially useful when working with cars.

You can use them to test different electrical systems in the car to see if there is a problem, as well as use them to check fuses or even the battery.

Finding the best automotive multimeter can be hard though since there are a lot on the market. We are here to help though. Following is a list of a few of the top automotive multimeters that we recommend.

What are the best automotive multimeter?

What is the best automotive multimeter?

Which Ones?

There are hundreds of different multimeters on the market, and they can range in price, so knowing which is a good one and which isn’t can be hard.

Luckily for you, we are going to take an in-depth look into five of the best automotive multimeters on the market. These are all top multimeters, and after reading farther, you will see why.

Best Automotive Multimeter - Top 5 On The Market:

1

Innova 3320


Innova 3320

Innova 3320

Starting off we have the Innova 3320. This multimeter is average size measuring 2”x10”x5” and weighing 1.25 pounds. This multimeter is UL certified meaning that it is safe for you to use.

It is convenient to use as well because it has auto-ranging scales meaning that you don’t have to change a knob depending on what you are measuring, it can sense this for you.

The 10 MegOhm input is safe for automotive and household uses (i.e., household outlets, fuses, wiring, general-purpose batteries, vehicle battery and charging system, automotive circuits and more).

The LCD screen is bright and easy to read and giving digital readings make it easy to use as well. There are also color-coded LEDs which makes quick battery checks fast (green = good, yellow = weak and red = replace).

The case is made out of strong, durable plastic, that will last awhile and can handle normal wear and tear. The corners also have rubber on them to help with drops.

There is a single switch to change between AC and DC which makes it fast to switch. The probes have a decent length which is nice, but the probes are where the biggest complaint about this unit comes in.

A lot of people have issues with them not being sensitive enough. Sometimes you have to fight with them to make sure they are making good enough contact to get a good reading. This can be annoying at times, but when it works, it works well.

Some other nice things about this unit are that it has customer support that you can call and get help, and it also has built-in auto turn off, so you don’t have to worry about the batteries getting wasted.

If it weren’t for the probe issues, this would be a great multimeter, but even with those issues, it is still a good one.

2

Innova 3340


Innova 3340

Innova 3340

Next is the Innova 3340. It measures at 12.5”x4.5”x6.5” and weights 1.12 pounds making it a little smaller than the Innova 3320 version. The Innova 3340 is similar to the 3320 but has more features built in.

The INNOVA 3340 is great for testing alternator diodes, duty cycle, solenoids, breaker points, wiring, switches, and more.

It is still UL certified making it safe for anyone to use and the case is still a durable plastic with rubber corners. The screen is also the same top quality screen, and it provides digital readouts. This model doesn’t have the LEDs for quick battery check, but it does have some other useful features.

The Innova 3340 can be used to find RPM readouts, alternator test, and temperature readouts. This makes it a very versatile tool and allows it to do multiple things with one device which is nice.

The only complaints with this unit again come with the sensitivity of the probes. Some people have been having issues of the lowest readout being in the .4 ohm range meaning that if your item puts out less then that, it won’t read it, or it will give you the wrong reading.

This is annoying, and if you are going to be using it with low sensitivity things a lot, then you might want to consider a more sensitive option.

If most of your use is going to be with things that put off more ohms though, then you shouldn’t have this issue, and that means that this is a great multipurpose multimeter. To top it off, it also comes with a nylon pouch so that you can take it anywhere.

3

Amprobe AM-510


Amprobe AM-510

Amprobe AM-510

Next is the Improve AM-510 with NIST certificate. It is normal size and weights 1.4 pounds. The NIST certificate means that it was tested at an outside 3rd party lab to make sure that the unit was calibrated right and gives proper readings.

This model have accurate performance for light commercial and advanced residential applications like rewiring an electrical panel, installing heated floors and light fixtures, troubleshooting and repairing home appliances, electrical sockets, and automotive electrical problems.

The unit is in a hard plastic case and is durable and will last for a long time. The LCD screen is bright and gives easy to read digital readings. It can be used to measure both AC and DC current and is easy to switch between the two.

This multimeter has a CAT III safety rating meaning that it can be used for high voltage things. It can be used for up to 600-volt items. This means any car batteries or household things will be fine.

Outside of reading the normal things of resistance, capacity, etc., it can be used to measure temperatures which are nice.

On top of all this, it has a built-in stand and probe holder to make it easier to measure things. It is like having a third hand.

The last thing that makes this easy to use is the built-in flashlight, so you can see where you are working.

The connector hole where the probes go into can also be hard to push the probes in, but after a few uses, this gets easier. The best solution is if you get a bad set of probes is just to get a different pair that will work with this unit.

Outside of the quality issues with the probes, this is a great unit that can do a lot.

4

Fluke 115 Compact


Fluke 115 Compact

Fluke 115 Compact

Now we are to the Fluke 115 Compact which provides the perfect answer for general purpose electrical and electronic test requirements. This model is also your average size and in a hard protective shell that will handle normal wear and tear. It comes with a soft case which is nice for carrying it around. 

It is CAT III safety rated so that it can be used for anything up to 600 volts. This means that you can measure pretty much anything. It can also be used for AC or DC and is easily switched.

The LCD screen is top quality and to make it easier to read it is LED backlit. This multimeter can be used for Resistance, continuity, frequency, and capacitance and had true RMS to give accurate readings.

The ergonomic design of the Fluke 115 compact makes it easy to use one-handed, but it also has a built-in stand to help make it easier to use as well.

It can be used in pretty much any temperature, so even if you live somewhere cold or hot, you won’t have to worry about that affecting the readings.

It is also really simple to use, and most people will be able to use it right out of the box within a few minutes. The probes that it comes with are pretty good, but some people have had issues with them not working right.

If that is the case, Fluke customer service is good, so they will get the problem fixed for you. This makes the Fluke 115 compact a powerful little tool.

5

Fluke T5-1000


Fluke T5-1000

Fluke T5-1000

Lastly, we have the Fluke T5-1000. This model is top of the line, but still only weighs 1.2 pounds. It comes with a NIST certificate meaning that it is calibrated correctly and going to give you correct readings.

It also can be used for up to 1000 volts and check current up to 100 A- without breaking the circuit, so there is nothing that this thing can’t measure.

It automatically detects between AC and DC making it easy to use. You can make readings with the probes which store away easily or the open jaw current measurer making it simple to use.

On top of all this, the leads and probes accept accessories to make them more useful in certain situations. You can put clamps on them, for example, to make them easier to hook onto something and stay.

On top of being able to measure all the normal things, the T5-1000 can also measure temperature. This means you can eliminate overheating as a problem right away.

This multimeter is also rugged and can handle any conditions you throw at it, so you can use it anywhere and don’t have to worry about it breaking.

The only downside to this meter is that it doesn’t come with a carrying case. They make one for it, but the H5 holster is sold separately. This is the only issue with this multimeter, and while it is nice to have the holster to make it easier to carry, it isn’t a need and doesn’t affect the function of this unit.

Recommendation

So which one should you get? Well, if you are using it every day, then you should get the Fluke T5-1000. That is because it can do pretty much everything and it can do it accurately.

This means that the readings you get can be trusted, and the T5-1000 is reliable. If you are just a hobbyist though, then the Fluke T5-1000 may be more than you need.

If you are only going to be using it around the house, especially for your car, then the Innova 3340 is the best bet. That is because it can still do a lot of different things.

It can measure the normal battery things as well as the alternator and RPMS. It is also a fairly reliable unit and easy to use.

None of the options on this list are bad though, so if you think one of them would work better for you, then it is safe to go with one of the others.

Conclusion


So know that you have read this you know more of what to look for in a multimeter. There is a lot on the market, but this list is a great starting point and will get you on the right track to finding the best automotive multimeter for you.

This list should at least help you be less stressed about the choice that you are making and if you pick one off this list, then you know you will be getting a good reliable multimeter.

Top 6 Best Battery Maintainer (Comparison Table) In 2019?

Finding the best battery maintainer for battery used in your cars, motorcycles, lawn mowers, boats, trucks, ATVs... can be a hard task. This is because there are a lot of different options on the market and the price can range a lot.

Luckily for you we have looked at a lot of different options on the market and have compiled a list of some of the best battery maintainer available.

Continue reading and you will learn which ones these are as well as what makes them good. We will also help you figure out which one is right for you.

best battery maintainer

Which is the best battery maintainer ?

Top 6 Best Battery Maintainers On The Market:

Read on to find all the different features that each of these have and their specifications.

1

Battery Tender 021-0123 Junior


Battery Tender 021-0123 Junior 12V, 0.75A Battery Charger

Battery Tender 021-0123 Junior 12V, 0.75A Battery Charger

Starting off the list we will look at is from Battery Tender, and it is model 021-0123 Junior. This model is an excellent 12-volt charger because it is small and compact. It measures 8 inches x 4 inches x 9 inches and weighs only 1.8 pounds.

This means that you can take it anywhere. You can carry it in your glove box and have it for emergencies whenever you need it. It connects to any battery with the clamps and plugs into any standard outlet.

This model  has a microprocessor controlled fully automatic charger and maintainer and is designed to extend the life of any lead acid battery commonly used in automobiles, motorcycles, ATVs, personal watercraft, RVs, boats, airplanes, golf carts, back-up generator systems, etc.

It converts the energy from the wall into a low .75 amp charge. This means it can take some time to charge something but is good because it won’t overcharge anything.

Also, to prevent overcharging it has three modes. An initializing mode, bulk charge mode, and float mode. This means it will charge your battery and keep it charged without overcharging. When the battery voltage drops too far under load, output power will begin again bringing you battery back to a fully charged state.

The cord is twelve feet long making it easy to reach anywhere. It also has a two-color LED so you can know what mode of charging it is applying to your battery.

Users love the easiness to use of this charger. They can plug it in, and it will start charging without any worries. It is spark-proof and reverses polarity protected. It even has a five-year warranty to give you peace of mind that it is a top battery maintainers.

Users also love that this can be used with any lead-acid battery. It doesn’t matter if it is a flooded battery, AGM, or another type. This best battery maintainer will charge it and keep it charged making sure the battery is ready to go when you are.

2

Battery Tender Plus 021-0128


Battery Tender Plus 021-0128

Battery Tender Plus 021-0128

The next one is also a product from Battery Tender brand, it is an upgrade to the Battery Tender 021-0123 Junior - the Battery Tender Plus 021-0128. This model is also a small unit at only 2.3 pounds and dimensions of 11 inches x 4 inches x 11 inches. This means that it is easy to take places if you need.

This battery maintainer is designed for 12 volt batteries and has a charging speed of 1.25 amps. The Plus is 50% more power which means a much quicker charge than the Junior. It is also a smart charger and will switch automatically between full charging power and float charge power.

This means that it can be used to charge and then maintain a battery at proper storage voltage which is good because it will not damage the battery it is hooked too.

The way this charger hooks to a battery is thru two wire leads that have alligator clamps. The leads are fairly long making it so you don’t have to remove the battery from a vehicle to charge it in most instances.

The alligator clamps are nice because it helps make sure that the leads will stay connected to the battery and not come off unintended. This battery maintainer is also easy to make sure that it is working.

It has a green and red light indicating that it is on and what kind of charge it is providing. Red is for full charge while green is for float. This is also nice because you can just look at the light to see if your battery is charged all the way.

The 021-0128 is also safe to use. It has reverse-polarity protection to ensure that you don’t shock yourself. This car battery maintainer also has temperature compensation features so it doesn’t get too hot. It does this because it can recognize the ambient temperature.

Also besides the alligator clips it comes with ring clamps too which are nice for things like mower batteries. The only real issue with this is the warranty. It comes with a 10 year warranty, which is great and most people don’t have to use it, but the warranty is a bit deceptive.

If you do have to use it, then you have to pay to ship the unit to them and you have to pay a warranty inspection fee. That generally doesn’t cost a whole lot and most people don’t have problems with their units, but it is something to be aware of.

3

CTEK 56-158


CTEK (56-158) MULTI US 3300

CTEK 56-158 MULTI US 3300

The next battery maintainer we will look at is the CTEX 56-158. This unit is even smaller than the first making it really easy to travel with or keep in your glove box. It comes in at a really light 1.5 pounds and measures 6.5 inches x 2 inches x 1.5 inches.

Even though it has small size, it still provides a big punch. It is a 12 volt charger and has a special four stage charging system, which we will explain in a second.

First though, the small case is dust and water resistant which means you can use it pretty much anywhere. This is really nice because it comes back to being able to just keep it in your glove box for an emergency.

The cords are well over seven foot long, so being able to plug them in should not be an issue. It comes with a set of alligator clamps and ring hooks, so you have either connection method that will work best for the battery that you are charging.

Now back to the four stage charging system though. The charger scans the battery and sees how much charge it needs, then it sends a charge to the battery, as it chargers it also uses pulsation technology to help desulfer the battery, after all that when it sees that the battery is charged it switches to a float charge.

Having all this is nice and even better since the charger does it on its own. The charger is also safe to use because it won’t start charging till properly connected, and it has reverse-polarity protection.

Users really love this best battery maintainer and it last a long time for most people. For those that it does die on it has a good five year warranty with good customer support. The unit is durable and shock proof though, so most people don’t have any complaints.

The one thing to be aware of is even though it is a 12 volt charger it sometimes gets up to 14 volts during its charging cycle. This means you should not turn on whatever you are charging while it is connected because you might blow a fuse or light. Outside of this though, the 56-158 is a good battery maintainers.

4

Optima Digital 400


Optima Digital 400

Optima Digital 400

Next up we have the Optima Digital 400. It is a battery maintainer at about 2.7 pounds and measurements of 8.2 inches x 3.7 inches x 7.4 inches.

It is a 12 volt charger and has a built in battery health mode so you can see the life of your battery. Like the others this has both type of connector clips and spark free connection to keep you safe.

This charger is nice though because it can revive batteries that are as low as 1.25 volts. This means that some batteries that other chargers can’t charge, this one can. It is also good on all kinds of batteries from cars, to boats, to mowers, and others.

What makes the Optima Digital 400 really unique though is the digital screen. This is nice because you can read the health of the battery, how much charge it has, how much charge that is being sent to the battery, and all kinds of other information on the screen.

This battery maintainer is also very durable and made well. Most users have no issues with theirs not working. If you do have issues it has a good warranty with good customer service, but the warranty does not cover the extra parts.

Also, the screen can become hard to read for some users which is frustrating since that is one of the main features. Outside of these few complaints though the charger does what it is supposed to and is easy to use.

This charger can start charging your battery fast. You just plug it in, hook it up, and use the one touch start mood. This mood scans the battery and starts charging it the way it needs too. Then once it is fully charged it switches to a float charge mood so as not to over charge the battery.

5

Battery Tender 022-0165-DL-WH 12-Volt 2-Bank


Battery Tender 022-0148-DL-WH

Battery Tender 022-0165-DL-WH 12-Volt 2-Bank

Here we have another one from Battery Tender and it is a little lighter
at 1.7 pounds and dimensions of 10.7 inches x 10.7 inches x 6.2 inches. 

The 022-0165-DL-WH 12-Volt 2-Bank is also really nice because it is a multi-bank charger (multiple battery maintainer). This means you can charge two batteries at once with it. This is really nice if you have a shop or a lot of batteries that need charged. You can get the 022-0148-DL-WH 12-Volt 4-Bank with 4 banks if you feel two banks are not enough.

It charges all the batteries at 12 volts and 1.25 amps. The charging station comes with leads for each one so you don’t have to worry about having enough. Also it has spark protection and reverse-polarity protection to keep you safe.

This charger has four stage charging as well. It has initialization, bulk charge, absorption mode and float mode. This means that it will keep your battery at a proper charge and increase your batteries life without hurting it by over charging.

The cords are long enough that you don’t have to pull the batteries if you don’t want. This is really nice to use if you have more than one car that you don’t drive in the winter and you want to keep the batteries going. Just have them parked by each other and hook them all up. Then just check it on occasion, but you should be good to go.

Users really love this unit and have had good luck with it. It has a 2 year warranty, but has the same issues like the other battery tender from Battery Tender that you have to pay a warranty inspection fee and shipping charges.

This is only an issue though if you stops working and for most people that won’t happen.

6

NOCO Genius G4


NOCO Genius G4

NOCO Genius G4

Last we have the NOCO Genius G4, is is both the a normal battery charger and battery maintainerThis is another multiple battery maintainer and has specs of 2.7 pounds and dimensions of 9.3 inches x 9.4 inches x 2.5 inches.

This maintainer is nice though because it can charge at 6 volts or 12 volts. This means that it can be used for even more batteries than the others on this list.

Also, since it is a multi charger with four spirit charging ports it can be used to charge two different types of batteries at once. This unit is 4.4 amps and has no spark features and the features the other ones have.

It can also effectively maintain automotive, marine, RV, powersport, motorcycles, lawn & garden and deep-cycle batteries. It charges 2x faster than ordinary battery chargers, can repair damaged batteries and is designed to use with micro-hybrid start-stop vehicles and CANBUS electrical systems.

Which One To Get?

So now that you have read about our list of six which one should you get. If you are needing a multi charger, then the Battery Tender 022-0165-DL-WH (or the 022-0148-DL-WH with 4 banks) is your nice option, you can charge two batteries at once with it. Or if you want a multi tender which can charge two different types of batteries at once, you can get a NOCO Genius G4.

If you just need a single charger though, then the four remaining options for that are all good, Battery Tender 021-0123 Junior, Battery Tender Plus 021-0128, CTEK 56-158 and Optima Digital 400 are good depending on what you need, so if you think one of them would work better for you, then it is safe to go with one of the others.

Conclusion


So as you can see there are a lot of different battery maintainer or also call with name battery maintainers for your cars, motorcycles...on the market and they are all slightly different.

Pretty much all the ones here though are good and while some users have had issue with each one, most of these the issues aren’t too common.

After reading this you should be able to comfortable pick out a best battery maintainer that will serve you well.

At least you have a better idea of what to look for now and also what are common things offered. You should be well on your way to finding the best battery maintainer for you.

What Does A Multimeter Measure?

So you have probably head of a tool called a multimeter and wondered what all in can measure. By the name you probably know that it can be used to measure multiple things, but aren't familiar with what.

Well, after reading this article you will have a better understanding of what all a multimeter can measure and also what a multimeter can be used for.

What Is A Multimeter?

What Does A Multimeter Measure

A multimeter

A multimeter is a small handheld device that is used to measure different things for different purposes. It is normally a device that most people have on their bench because it is really handy and can do a lot of things.

The come in both analog and digital versions. Are in a plastic shell and durable. Nicer ones may even have a rubber case around them to keep them from getting scratched up or protect them if they are dropped.

These are the basics of what a multimeter is physically, so keep reading to find out what a multimeter is on a deeper level.

How Does A Multimeter Work?

Before we get into what a multimeter can measure it is a good idea to have a basic understanding of how it works. A multimeter is pretty simple especially depending which one you have.

There are a variety on the market, but they all work in similar ways. Here we will look out how the most common work. The most common multimeters have two ports where you plug the leads into. The leads are wires with a metal prob tip.

Inside the multimeter is a coil which is suspended in a magnetic field. Their are also different resistors. When the probes are applied to an energy source it makes a current and this causes the coil to spin. The spinning coil then gives a reading on what ever you are measuring.

Some multimeters are digital. These work in a similar way, but the movement of the coil is able to be converted to a visible number output with computers.

The advantage to a digital multimeter is that they last longer and don't have interference issues. They also provide more accurate readings.

What Does A Multimeter Measure?

What do A Multimeter Read

What does a multimeter read?

So now that you know how a multimeter works we can get into what they read. All basic multimeters can read:

  • check
    Current
  • check
    Voltage
  • check
    Resistance

More advance multimeters can measure others things as well which we will get to farther in this article.

1. Current

Is the measure of the flow of electricity through a conductor. For a multimeter the conductor is the wire that connects the diodes and then the coil inside. This is easily calculated with the twisting of the coil or through computer processes.

2. Voltage

So first we will look at voltage and explain what it is that is actually being measured. Voltage is the difference in electric charge between two points. The way this is measured is you put the two probes on the diodes and this causes a circuit to be formed.

 When the circuit is formed energy flows from one point two the other. It passes through the multimeter and that is able to tell you how much is flowing through. This is because electricity always flow from low to high and it is a never ending cycle.

Inside the multimeter it also uses a resistor so help with the calculation. This is because there is a direct relationship between voltage, resistance, and current. If you know two, then the third is easy to find and we already know that a multimeter can find current.

3. Resistance

Lastly all multimeters can measure resistance. Resistance is ability to not have electricity flow through it. To measure resistance the multimeter just has to provide a known amount of voltage and the already knows the current.

Then it calculates the resistance since it is a direct relationship with the other two. This is similar to how it finds voltage, but just changes what part of the equation it provides. 

Multimeters do not measure all three things at the same time though. Most multimeters have knobs and you can turn that to tell it what you want it to measure.

Other Things A Multimeter Can Measure?

So what else can a multimeter measure besides current, voltage, and resistance? Well, the answer is all sorts of things. Some multimeters can be very costly, but these costly ones can measure temperature, humidity, frequency, capacitance, decibels, and even more things. The advanced multimeters are little handheld computers that really have no limit on what they can do.

What Are Multimeters Used For?

What Are Multimeters Used For?

What are multimeters used for?

This question also has pretty much no limit to it. Most normal people just use them around the house to test simple electronics like appliances or batteries, but the potential there is no limit. By the way, if you are looking for an tender for your batteries , you should look in my post about best battery maintainer to pick one. 

Electrical engineers use them all the time for common things to advanced things. They don't have to just be used in the construction or engineering field though.

Multimeters are even used in science labs for testing all kinds of things. These advanced elaborateness can measure anything and are made to be very accurate.

Specifics

Multimeters are basically a bunch of tools in one. They are a voltmeter, ohmmeter, and ampmeter all combined. The advanced ones are even more than this. Multimeters can also be used to measure direct current or ac current.

Some have switches that have to be flipped to change this and others just are able to do it on their own. Some multimeters can even give out readings in multiple units. You can choose the unit that you want the reading to be given out in.

Conclusion

So now you know how multimeters work and also what they are used for. More importantly though you know all the things that they can measure.

Most basic multimeters can measure current, voltage, and resistance. Advanced multimeters though can be used to measure all kind of things from frequency, to temperature, to humidity, and even more.

Voltmeter vs Multimeter: What Are The Differences?

There are a few different devices to measure different things when it comes to electrical things such as batteries. You have a device called a voltmeter that measures one thing and a multimeter that measures others.

What does each one do exactly though? Well, read on to find out what each device is meant to do and also the differences between the two devices.

Voltmeter

A analog volmetter

A analog volmetter

We will start out with talking about a voltmeter since it is the more simple of the two. A voltmeter is designed to measure the difference of potential between two nodes in an electric circuit. This is known as voltage.

Voltmeters can be designed to measure both direct current circuits and also alternating current circuits. Some special voltmeters can even be used to measure the voltage of radio waves.

The way a voltmeter works is that it has a fine wire coil that can carry current. This is connected to the power source with leads with metal tips. Some also have clamps. The fine wire is suspended in an external magnetic field.

When a current is applied this causes a magnetic field in the coil which reacts with the other magnetic field. This causes the coil to route and this rotation moves the needle that gives you the reading.

With modern technology though some higher end voltmeters are digital. The digital ones work in a similar way, but with the computer inside it is able to turn the electrical reading into a number that appears on the screen.

The digital ones are more accurate because you don't have to worry about something happening to the coil inside the voltmeter or interference with the magnetic field.

Multimeter

A multimeter

A multimeter

Now we will move on to the more advanced multimeter. Even though it is more advanced it actually works in pretty much the same way as a voltmeter. It still has a coil and magnetic field and when a current is applied it reacts with the magnetic field to give a reading.

The resistors though are a little different and this is where multimeters get their name because they are able to measure multiple things.

Most multimeters can measure voltage, ohms, and ampere. You just use a dial to set it to what you want to measure. With multimeters though there are a lot on the market. (Click to get a best automotive multimeter for your car).

Advanced multimeters can do all kinds of things. The price range can vary, but the advanced ones are nice. They work in a more complex way and are normally digital.

Advanced multimeters can measure all kinds of things from temperature, to humidity, to frequency, and even more. Multimeters are used in all kinds of settings and they even have lab grade ones.

Other Differences

What is the difference between voltmeter and multimeter?

What is the difference between voltmeter and multimeter?

So now you know the basics of a voltmeter and a multimeter. You know how they work on a basic level and what they can do. Here in this section though we will go into even more detail of the differences. 

A voltmeter is basically one part of a multimeter. This means that voltmeters are generally cheaper than multimeters. A voltmeter only measures volts where multimeters can measure multiple things.

With this information you can also assume with good reason that voltmeters can be used for less things than multimeters. Voltmeters are good for electrical work, electrical enginering, and household appliences. Multimeters can be used in pretty much any field.

Conclusion

So as you can see both these tools have their purpose. For most people a standard voltmeter will probably get the job down for things around the house, but it doesn't hurt to have a cheaper multimeter around just in case.

If you work in science or labs though, then you may use an advanced multimeter. Voltmeters and multimeters really aren't that different. They both work with coils and magnetic fields, but a voltmeter is just one part of a multimeter.

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Now you should have a better understanding of when you might use a voltmeter verses a multimeter and have a better understanding of the differences between the two.

How Many Amps Is A Car Battery?

This article will look at how many amps are in a car battery.

It highly depends on the battery, each battery should have a rating, some batteries can deliver a very high current, c. 1000 amps for short periods. Batteries are more commonly measured in Ah (amp hours). 

So, we are going to be focusing on amp hours and not cold cranking amps in this article.

An amp-hour (Ah) is how many hours a car battery can put out one amp for one hour, so if the car battery is 40 amp hours, then it can put out one amp of power for 40 hours. 

After reading this, you should be able to figure out how many amps is a car battery.

how many amps is a car battery

How many amps is a car battery?

Check Battery

The easiest way to figure out how many amps our car battery is is by just looking at the tags on it.

Car batteries can range from 40 amps to as high as the low hundreds, so there is not one set amount of amps in a 12volt car battery.

Most batteries, however, don't have wrote on them how many amps they are. This can make it hard to figure out how many amps your battery has. One rule of thumb is the bigger the vehicle, the more amps the battery has.

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Use a Chart

Since your battery probably doesn't have wrote on it how many amps it is, then you might have to use a chart and get an estimate. The battery will have written on it the class of battery it is, and this will help you figure out the amps.

Once you know the class you can look up battery amp charts and see a close estimate of how many amps your particular battery has.

Using a Resistor

Using a Resistor

Using a Resistor

Another more scientific way to find out the amps of your battery is by using a resistor. You hook this up to the battery, and it applies a draw on the battery.

You want to make sure your battery is fully charged when you start to get the most accurate estimate. The resistor should be 1ohm, 200watts. 

After connecting the resistor, you will want to check it every hour or so and see how long it takes the battery to drop from 12.6 volts to 12 volts. This is about a 50% drop in power.

Once you have the time that it took for that to happen. You take the current measured thru the resistor and multiply it by the time that it took to drop to that point, so if it took 10 hours for it to drop to 12volts, then you have a 120amp hour battery.

This test should be done at around 77 degrees because if it is warmer or colder, it will affect the discharge of the battery. Also, the voltage should drop around .1 volt every two hours or so.

If it is dropping faster or slower than that, then you might be using too much or too little voltage to get an accurate estimate.

Using a Voltmeter

If you know the amps your battery is supposed to be and want to see how many your battery has in it, then you can use a voltmeter. You do this by taking your voltmeter and connect it to the battery.

Some nicer volt meters have clips that hook right on to the battery. Others though have metal rods that you have to hold on to the battery post. For these you might need two people, but probably not.

Using a voltmeter

Using a Voltmeter

Once you have the voltmeter connected it will give you a reading. For a car battery that it's fully charged it should read around 12-13 volts.

This is because each cell in a battery is 2.1 volts and six cells are adding up to 12.6volts, but there is some leeway depending on how old the battery is. 

So reading it, some have needles, and some are digital. The digital ones are easy since they display a number, but the needle ones are a little harder. For a needle one, you have to look to see where it lines up and read the volt number.

Some voltmeters have more than one number, so you have to know which one is for volts. Once you do that, you have to do the math to find out how many amps are in the battery if that is what you are worried about.

Some voltmeters do have a spot to tell you amps, so if your has that number and that is what you want to know, then you don't have to do that math to convert volts to amps.

If you have to do the math, then you need to know the maximum amps your battery holds, and that varies from battery to battery, so you will have to read it.

Once you know, you can take the volts that it has and divide it by 12 or a full battery. You then take that percentage and multiply it by the number of amps your battery can hold to find out the amps your battery has.

You can also use a car battery tester or a automotive multimeter to check how many amps your battery has in it.

Caution

Caution

Just because the reserve amp hour on most batteries is low doesn't mean you shouldn't be careful with them.

Most car batteries can deliver a lot of amps at the beginning for a short period when cold cranking, so when working with your battery trying to find the amps out you need to be careful and use safety precautions. 

Wear insulated gloves, and make sure that no wires are exposed that could lead to you getting electrocuted or a short happening.

Conclusion

So after reading this, you now know that car batteries come in a wide range of amps. Most, however, are in the range of 40amps to 120amps or so, and the bigger the vehicle, the more amps the battery can hold.

Also, the amps we are talking about finding in this article is the reserve amps and is much lower than the cold cranking amps. You have learned that the best way to find the amps is to read the battery and if it doesn't say to find the class level of the battery and use a chart to find the amps that it has.

If you can't do that though, then you can use a resistor and apply a charge to the battery and see how long it takes to drain. You can then do some math to estimate the amps.

Lastly, if you know the amp your battery should be and want to find out if yours has that much, you can use a voltmeter and some math to check that.