Category Archives for "Diagnostic"

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
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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.


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.


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.


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.


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.


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.

The best battery tender also popular tool, you need to have one to maintain you battery. 

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.

Choosing a tool to recharge your battery is not easy, take a look to my post about top rated best battery tender to choose the good one. 

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.



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.


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.


How Long To Charge A Car Battery At 2 Amps?

Charging times for a battery can vary by a few different factors. One is how much charge the battery has, and two is how many amps you are charging it at.

After you read this article, you will learn how to calculate the charging time for your battery and also the way to charge your car battery.

You will also learn why two amps is an ideal charging power. Continue reading to learn how to figure out how long it will take to charge your car battery. For charging a battery, I recommend you should have the best battery tender to do that. It is the best tool to recharge and maintain battery.

How long to charge a car battery at 2 amps

How long to charge a car battery at 2 amps?

How Much Power Left?

The first thing to do before figuring out the charge time for a car battery is figuring out How much charge the battery has left. The best way to do this is to first read the battery and see how many amps it is.

Car batteries range in amp hours from 20 to 60 for most vehicles. Once you know the amp hours, you then can hook automotive multimeter  or a car battery tester up to the battery to read the charge.

A car battery is 12.6 volts when fully charged, so knowing this depending on the reading you can calculate how much charge the battery has.

For example, if it reads 6 volts, then you know that it is roughly fifty percent charged. You can then take the number of amp hours the battery is and multiply it by the percent to see how many amp hours are left. For example, if you have a 48 amp battery and it is fifty percent charged, then it has about 24 amps left.

Using this method you can find out how many amps are left in any battery. Once you have calculated this, you are close to figuring out how long to charge your battery to get it back to the full charged. Before we get into that though, I will touch slightly on what an amp hour is.

How much charge the battery has left?

How much charge the battery has left?

What Is An Amp Hour?

Amp hour is how much power is put out to run a specific function of the car for a set amount of time. If you have a 50 amp hour battery, then it can put one amp out for fifty hours before being completely dead.

Certain things on your car draw a specific amount of amp hours. There are a lot of factors that go into how many amp hours something draws though.

For example, headlights can use 8-12 amps for most modern halogen bulbs, but in older muscle type cars they could use as much as 20 amps. This means if you have a 50 amp battery and headlights that draw ten amps, then they could run for five hours.

There is more than just headlights though that draw amps. That is why on short trips your battery may nor get completely recharged, which is where charging might become needed if you take a lot of short trips.

This is especially true in the winter months. Now that you know more of what an amp hour is we can get back to calculating how long it will take to charge your battery.

Calculating How Long to Charge Battery

How long to charge battery

How long to charge battery?

So we mentioned one factor for charging the battery was determining how much power was left and the other is the amp rate that you are charging it at.

For this article and example, we will be using a two amp charger. Once you know how many amps are missing from the battery, it is a matter of just simple math to find out the time to charge. You take whatever amount is missing and then divide by two.

For example, if you have a 50 amp battery that is half depleted, then it has 25 amps missing. You then divide 25 by two since that is the charging rate to get 12.5.

This means it will take 12.5 hours for the battery to be completely charged. If you are using a different charging rate, then you just divide by that number instead.

Read on through to find out why two amps is a good recommended speed.

What amp to charge car battery? Why Charge at Two Amps?

The main reason to charge at slower speeds or two amps is that faster charging can cause damage to the battery. It can buckle the battery plates, and this will make the battery not function right and can damage other areas of the car.

Also, if the battery gets hot while charging then keep an eye on it and unplug it if it gets too warm. If you have a temperature gauge and your battery gets 125 degrees Fahrenheit, then you need to stop as soon as possible.

Another final reason that fast charging is bad is that it can lead to overcharging which hurts the batteries useful life.

Should you use 10 amp charger or 2 amp charger for car battery?

A lot of people wonder which is better to use a 2 amp or 10 amp charger for your car battery. Well, we are going to answer this for you.

The key thing to remember when charging a car battery if you don’t want to charge it too fast because this can cause damage to it. However, you don’t want the charging to take forever either.

A car battery is typically 48 amps. This means that a 2 amp charger will take 24 hours. A 10 amp charger, on the other hand, will take 5 hours.

For a car battery in most cases, it is okay to use a 10 amp charger and is normally the recommended amount. This is because it charges fast enough to not have to wait forever, but it doesn’t charge so fast that the battery will be damaged.

So, if you have to choose between  2 amp or 10 amp charger the next time you are charging your car battery, it is okay to use the 10 amp charger.


Enjoy your car

Enjoy your car!!!

Finding out how long to charge a car battery at two amps isn’t that hard. It takes some basic math that anyone can do and also some basic tools that are easy to use.

You have to know how much charge is left in your battery. Convert that to amps, and then divide the missing amp hour amount by two to figure out how many hours it will take to fully recharge the battery.

If the speed you are charging at is different, then the math is the same steps, but just with different numbers. This means that now you should be able to calculate how long to charge any battery.

How Many Volts Is A Motorcycle Battery?

You may know that different types of batteries have different charges or volts to them. This is because they need a different amount of power to operate.

For example, your TV remote doesn’t need a lot of power, so it doesn’t use many volts. This means that a TV remote would have fewer volts in it than a car battery.

In this article though we will look at how many volts are in a motorcycle. Is it the same as a car battery or less? Well, once you are done the reading, you will know how many volts is a motorcycle battery and also anything else related to this that you might need to know.

How many volts is a motorcycle battery?

How many volts is a motorcycle battery?

Maybe you’re interested:

Are Car And Motorcycle Batteries The Same?

Well, I am not going to waste your time here. We are going to get right into answering some questions. The first one we will look at is are a car and motorcycle batteries the same voltage? The answer to this is it depends.

Pretty much all car batteries have a voltage of 12.6 when fully charged. They are called 12-volt batteries though. The charge can jump to a range of 13.6-14.6 volts when the car is running. That is because the alternator is feeding the battery charge and it isn’t being drawn that fast.

The reason why it depends is depending on the type of motorcycle you have will determine the type of battery that is in it. Some bigger motorcycles might use standard car batteries or at least they use 12-volt batteries.

Think of your Harley Davidson and chopper type motorcycles. These bigger rides do use 12-volt batteries, so they are the same as a car battery. This means that you can charge them using something that is designed to charge a car. Some motorcycles don’t have this size battery though.

What Size Do They Have?

If they don’t have 12-volt batteries, then what size do they have? Well, some smaller motorcycles and especially scooters have 6-volt batteries. This is because they don’t use as much power when driving.

Also, by having a smaller battery on the vehicle, it cuts down on weight which can help on speed. Small things such as crotch rockets you want to be lit so they can go fast. These little rides have smaller batteries to help with this.

A 6-volt battery though when healthy is more than that, just like with a bigger battery. A typical good 6-volt battery has 6.3 volts. This voltage again jumps some while the motorcycle is running. When the motorcycle is running the charge is normally around 7 volts or so when it is a new good working battery. You can use a car battery tester or a automotive multimeter to check how many volts it has exactly.

Some smaller motorcycles and especially scooters have 6-volt batteries

Some smaller motorcycles and especially scooters have 6-volt batteries

Why Is The Voltage Higher Then What Says?

The next question you might have now that you know the voltage of the different types of batteries is why is the voltage higher then what the battery says?

Well, we have already discussed why the voltage is higher when the motorcycle is on, but the reason the voltage is higher than advertised even when the vehicle isn’t running has to do with how the battery is made.

Most batteries for cars and motorcycles are lead-acid batteries. This means that they have a lead-acid mixture inside of them that holds the charge. The electrons move thru this and into the different parts of the car.

This is a really simple explanation but gets the job done. The electrons are broken into compartments called cells. Each cell in a battery holds 2.1 Volts. This can still range some, however.

Since the electrons are moving from cell to cell and then into the parts of the car, when you turn the motorcycle off, one cell might end up with more electrons than a neighbor.  This is why if you measure the volts of each cell, they will be different.

One cell may not last as long as another cell either. This means you might end up with a cell that can only hold 1.5 volts while the rest are holding 2.1 and the reading would still be close to the proper amount of 12 or 6 volts.

The loss of the ability to hold the charge can come from a variety of reasons, but the main one is sulfur build up. I am not going to go into a lot of detail of why a battery might not hold a charge though because there are many reasons, and that is a whole different article.

A motorcycle battery

A motorcycle battery

So, now you know the charge is broken into cells. For a 12 volt battery there are six cells, and for a 6-volt battery, there are only three cells. This helps explain why the 6-volt batteries are smaller. They have half the amount of cells in them than a 12-volt battery.

The cells are held in place with a plastic enclosure. This enclosure is the main part of the battery you see, and the two end cells have diodes that pop out of the top of the case that is your positive and negative leads.

This is where the wires hook up. Knowing the basics of how a battery is made up though can help you with understanding how the different voltages work and why they have different voltages.

Need to recharge your motorcycle battery, let use the best battery maintainer for motorcycle, it is an essential tool of biker.

Is One Type Of Battery Better?

The last question we will look at is if one type of battery is better or not. This means should you try to buy a motorcycle with a 12-volt battery or get one with a 6 volt or does it matter.

The answer is it doesn’t matter really battery. Both 12-volt batteries and 6 volts do what they are supposed to do. They are relatively the same, and the only thing different is the number of cells. They will still drain the same way and still age the same way.

Also, the same things that might cause one to not last as long will affect the other. This means that you shouldn’t make your motorcycle purchasing decision just based on the size battery it uses. Buy the motorcycle that makes you happy and doesn’t worry about the size of the battery.

Buy the motorcycle that makes you happy and doesn't worry about the size of the battery

Buy the motorcycle that makes you happy and doesn’t worry about the size of the battery!!


Now you know that motorcycles have two different standard battery voltages. Some motorcycles use a standard 12-volt battery. These are your bigger motorcycles that need the power and aren’t worried about cutting weight. Smaller motorcycles though use a 6-volt battery.

This is because the battery is smaller and they don’t need as much power. You also know how a battery works now and that they all drain the same way. When buying a battery just take the old one with you, so you make sure you are getting the right voltage for your ride.

Top 5 Best Car Battery Testers In 2019 (Detailed Reviews)

There are a lot of car battery testers on the market so finding the best one can be a challenge. Instead of you having to try out different ones though, we will make it easier for you and provide a list of some of the top battery testers.

We will look at the benefits and negatives of each one, and the end gives you our recommendation. Continue reading to find out which one our experience has determined is the best one.

best car battery tester

Which is the best car battery tester?

Top 5 Best Car Battery Testers On The Market


Schumacher BT-100 100 amp Battery Load Tester

Schumacher BT-100 100 amp Battery Load Tester

Schumacher BT-100 100 amp Battery Load Tester

The first battery tester we will look at is the Schumacher BT-100. This is a simple battery tester which comes with the benefits of being easy to use.

The good thing about this model is it is still fairly small. It weights 2.7 pounds and measures 15”x7.5”x3.5”. It can still fit in a glove box if needed but is more suited to be carried in a toolbox.

This model is great for everyday use on 6V and 12V batteries. It can test load, battery condition, starter motor draw, and offers complete charging system diagnosis.

One thing that users love about this model though is it has alligator clip connectors. This makes it easy to connect the ends to the battery and you don’t have to hold the ends on there.

That makes using this tester way easier. This one also does have a few more features than just testing the battery charge, but not all the bells and whistles.

Users love that they can use this model to test the start draw. This means you can find out if your starter is bad while this one is connected.

It can also diagnose the complete charging system in your car which means you can find out if the alternator is working properly and charging the battery.

Users love that this one can do those things because it allows them to troubleshoot some things with there car battery and make sure other things aren’t wrong before getting a new battery.

The big problem with this unit, however, is that some users have issues with it getting too hot. This hasn’t been across all units though and could have just been a bad batch.


Clore Automotive SOLAR BA9 40-1200 CCA Digital Battery and System Tester

SOLAR BA9 40-1200 CCA Digital Battery and System Tester

SOLAR BA9 40-1200 CCA Digital Battery and System Tester

Next, we have the Solar BA9. This model is starting to get more into the more advanced models. The digital LCD screen is optimized, so it is easy to view in all lighting conditions which users love.

Also, this is a small unit which people like. It weighs 3 pounds and measures 10.3”x7.1”x2” making it nice and compact to fit into a glove box.

The controls on this model are easy to use and make it easy to scroll through the different menu options. The way this is connected to the battery is also high end. The alligator clip connectors are top quality, and users have been able to use this tester for years.

Users also love that this model has been showed to test accurately multiple battery types. It can test all four of the most common battery types (including Flooded, AGM, Spiral and Gel Cell) and gives accurate results on charged and discharged batteries  (down to 7 Volts).

Solar BA9 has wide operating range tests batteries all the way down to 40 cold cranking amps and as high as 1200 cold cranking amps.

These is good because you don’t have to worry about your battery tester not being compatible with your battery model or giving you false results.

It is safe to use. It doesn’t get hot while testing and the instructions are easy to follow. Also, it has overvoltage protection and reverses polarity to make sure you don’t get hurt while using it.


FOXWELL BT705 12V 24V, 100-2000 CCA Battery Analyzer 

FOXWELL BT705 12V 24V Battery Analyzer

FOXWELL BT705 12V 24V Battery Analyzer 

The next model we will look at is the Foxwell BT705. This is a fairly advanced model as well with a nice bright LCD screen. The size is good which makes it easy to store and use.

It weighs 3 pounds and measures 13”x3.2’’x9.1”. Users like how this model can do more than just check the charge of the battery. The clamps on this model also work well.

The BT705 can do a load test, charging test, and starter checks on top of checking the voltage of the battery making it a useful tool.

This model can test batteries from rated from 100 to 2000CCA and multiple battery types- regular flooded, AGM flat plate ,AGM spiral and gel. It also test 12&24 volt charging system with quick and accurate test result display in just 3 seconds.

The menus are easy to navigate, and the buttons are of good quality. Users like the ability to use this tester easily without much experience.

Also, the tester is sturdy and built well meaning it will last a long time. The rubber sleeve helps protect it from scratches or drops.

The one flaw with this model is that it needs updates to make sure it functions right and some users have had issues doing that.

Depending on the type of battery you have, this might not read it accurately unless you install the update. The update issues have only been for some people though and could have just been bad internet and not the unit itself. This is still a good unit but is something to remember.


Schumacher SE-4022 2/10/40/200 Amp Manual Wheeled Battery Charger and Tester

Schumacher SE-4022 2/10/40/200 Amp

Schumacher SE-4022 2/10/40/200 Amp Manual Wheeled Battery Charger and Tester

The next tester we will look at is the Schumacher SE-4022. This is a powerful device that serves double duty as both a tester and a charger.You can test a battery to make sure it needs charging before starting to charge it.

This battery tester is larger at 14inches x 14inches x 20inches and weighs 27.3 pounds, but it does have wheels so that you can roll it around your shop. 

One nice thing about this tester is it accommodates 6-volt and 12-volt batteries so that you won’t need any other tester or chargers.

The tester’s cables are six feet long which gives you a total of twelve feet of reach since there are two cables. This means you won’t have any problem with being able to connect this tester to the battery.

This tester can not only test your battery, but it can also check your starting system and other electrical systems. It does this with two rotary switches that are included.

Also, built into this tester is a voltmeter, so you won’t have to have an external one. The tester has bright, colorful gauges that make it easy to read.The cool thing about this tester is it can be used to start an engine in a pinch. It can put off 200-amps when needed.

As a charger, it has a 40-amp mode and a 2-amp mode. The 40-amp model is best for charging larger batteries or charging quicker. For slowly charging the battery or for smaller batteries you can use the 2-amp trickle charge mode. It also has an auto shutoff switch.

Having all these features makes it a nice all in one tester and charger combo.The only complaint is that some units have came broken, but customer service has fixed that error, and it seems they are packaging them better now to prevent this.

 With all that is built into the Schumacher SE-4022, it is an excellent multipurpose tester and charger.


SOLAR BA327 20-2000 CCA Electronic Battery and System Tester with Printer

SOLAR BA327 20-2000 CCA Electronic Battery and System Tester with Printer

SOLAR BA327 20-2000 CCA Electronic Battery and System Tester with Printer

Another more advanced model from Solar is the Solar BA327. This model can do pretty much everything, which users love.

It is a bigger battery tester, but that is because it is also a printer. The Solar BA327 wights 5 pounds and measures 14.5”x10”x3.3”. This means that it is still small enough to carry around, but you probably want to carry it in a toolbox.

This battery tester does pretty much everything, and there isn’t anything bad to say about it. It can test multiple battery types (including Conventional, AGM, Gel Cell, Spiral Wound and Deep Cycle Batteries), 6 and 12 volt batteries from 40-2000 CCA, operating range from 1.5-30V,  6, 12 and 24V system testing.

This model has long cable leads which are extra long at 10 feet meaning you won’t have any problem connecting it to the battery.

Also, the clamps are high-quality alligator ones. This scanner can test every battery type so that you won’t have compatibility issues and it can test drained or charged batteries. Also, it has temperature compensation built into it, so if it is hot or cold, that won’t affect the reading.

This unit is also multilingual, so anyone can use it and understand it. The menus are easy to navigate, and the printer feature is nice so that you can document things.

This will test all parts of the battery electrical and charging system meaning if there are any issues anywhere it will let you know. The printed report is easy to read and makes keeping track of multiple vehicles scans easy. The Solar BA327 is great and is the do all of the battery testers.

Which Is For You?

Which is the best battery tester

Which is the best battery tester for you?

The best car battery tester out of these depends on what you are needing. If you just want an easy to use simple unit, then the best one is the Schumacher BT-100. It is built strong and does the job it is meant to do very well. 

If you need a a powerful device with tester and charger combo, you can choose the Schumacher SE-4022. It is an excellent multipurpose tester and charger.

If you are an advanced user or shop owner though, then you will want a more hi-tech unit. If that is the case, then you can’t go wrong with the Solar BA327.

It does everything and the printer built in is a nice perk. If you go with the Solar BA327, it will most likely be the last battery tester you buy because it does all the things you will need it to do.

In addition, Foxwell BT705 vs Solar BA9 are good depending on what you need, all product descriptions mentioned above, you can rely on that to choose the product that best suits you.


All the units on this list though are good and have there pluses and minuses. Now that you have read the reviews you can match your needs up to them and find the best car battery tester for you.

You can’t go wrong with any on this list. They will all do what you need them to do, and you will get results easily that make you satisfied.

How To Tell If A Car Battery Is Dead?

A dead car battery is one of the most common reasons why your car won’t start out of the blue when you go to start it. It can be dead for different reasons, and sometimes it is genuinely dead while other times it was just drained.

This article will go into how to tell if a car battery is dead, and also help you figure out if it was just a one-time thing from being drained or if it is indeed dead and time to get a new one.

How to tell if a car battery is dead

How to tell if a car battery is dead?

Signs Of Dead Car Battery.

There are a lot of signs that your car battery might be dead. We will go into more detail of each in its section, but the main ways of knowing if your car battery is dead are slow engine crank, check engine light, and issues with other dashboard lights or electronic components.

Also, there are a few other less visible signs, but still important ones, especially when it comes to troubleshooting. Those are swelling of the battery and odd smell to the battery. If your car is not dead and you want to recharge your battery, i recommend you use the best battery maintainer for car battery, i think you will love it.

1/ Slow Engine Crank

The most prominent sign of a dead battery is a slow engine crank or clicking engine. The battery works with the starter to get the engine to turn over.

If the battery does not have enough charge left in it, then it can not get the starter going enough to get the engine to fire.

The first time a week battery tries to start the engine, it might work but will be slower and take longer. It is essential to be familiar with your car and how long it usually takes to turn over because if it is slow, it might be your last shot to start the car without jumping it.

If the battery is already too far dead, then instead of having a slow engine crank it won’t start at all. Instead, when you turn the key, you will have a clicking or grinding sound.

The more you turn the key, or longer you turn the key, the softer this sound will get because you are draining the battery even more. Once it is 100% depleted it won’t make a clicking sound at all.

2/ Power Features Not Working

The next most accessible sign to know if your battery is dead is to pay attention to the power features in your car. For example when you open the door if your dome light does not come on or is not as bright as it usually is, then that is a good sign your battery is weak.

Your battery also powers every other thing in the car. If you stick the key in the ignition with your door open and it doesn’t beep at you, then that is also an indicator that your battery is low or dead.

Other things you can turn on to confirm that it is the battery and not just a fault in that one particular system is you can turn your headlights on, your radio on, try to use your windows or even your wipers.

If the key is in the battery on position, then these will work if the battery is okay. If the battery is indeed dead, then none of these things will work. This is an excellent way to confirm a dead battery.

3/ Warning Light

Some cars will have a check engine light or battery light on the dash when the battery is starting to get old and wear.

If you get a check engine light or battery light, then that is an easy way to know that the battery is having issues though. Not all battery lights though mean the battery.

Depending on the car if other lights come on with the battery light coming on it could be telling you that the alternator or something else is going bad.

If you get any lights on your dash, it is a good idea to use a code reader on it or have someone do that for you so you can know precisely what is wrong.

4/ Swollen Battery And Smell

The last sign is a visual one that you have to check under the hood for. When you go to jump the car, you may notice that the battery looks swollen or smells funny.

This is because chemical reactions are going on in the battery and as it ages it starts to swell or smell.

If your battery is old, then this is a good sign to know that the battery being dead wasn’t just a one-time thing but will keep happening.

How To Know When To Replace Battery

How to know when to replace battery?

How to know when to replace battery?

Sometimes the battery being dead is just a one-time thing or a fluke. You might not have shut the door all the way, and the dome light or headlights could have drained it. This has happened to most people.

The best way to know if your battery is truly dead or just got drain from an outside cause is to have a battery test ran on it. You can use a voltmeter or a automotive multimeter  and see how much charge it has, but this won’t tell you if it is going to hold it.

Also, you might have a short in a system drawing on the battery, and a volt meter won’t help you with that either.

The best thing to do is take your car to a shop or any auto parts store. They will have a battery load tester. This device hooks up to the battery like a volt meter and can give you a readout of the current voltage and any draw being put on it.

Also, you can run a road test and rev your car for around thirty seconds while the machine is attached. This will let you know if the alternator is charging the battery, how much draw is being put on the battery, and the health of the battery. If the battery is old, this is the best way to know if you should replace it or not.


So there are a lot of signs that a battery is dead or dying. There are a mix of visual symptoms and also audible signs. First just pay attention to when you start your car, and if it seems like it took longer to turn over, then you might want to have the battery checked.

Also, pay attention to when you get in your car. If lights don’t turn on or if the vehicle doesn’t ding once you put your key in when the door is open, then the car battery is most likely dead. It could have just got drained from accidentally leaving something on, but if it is old, then it is probably not holding a charge which means it is time to get a new battery.

How Many Volts Is A Car Battery?

So you may be wondering how many volts is a car battery. This question could come up to you for multiple reasons. One could just be that you want to learn about your car. Another thought is maybe your car won’t start, and you think it is the battery.

Well, after reading this article you will learn the proper amount of voltage that should be in a car battery. The answer to how many volts is a car battery may surprise you.

Car Battery Voltage

How many volts is a car battery?

How many volts is a car battery?

A car battery is 12 volts, but this is misleading. This is because a car batteries voltage changes depending on if the car is on and off and how much draw is being put on the battery.

This means that while the vehicle is on a good battery will read higher than twelve volts. You might be thinking though that with the car off a good battery will read twelve volts then, this isn’t the case.

A good battery, at rest with the car off, should read between 12.6-12.9 volts when fully charged. This is because the battery is made up of cells usually. In a standard car battery, there are six cells, and they are connected in order.

This causes the voltage of each cell to add up. Some of the cells may have more than two volts while others have less. As long as it reads at around 12.6 volts though it means it is fully charged.

As the battery ages though the cells cannot stay charged as long or to the maximum. This is similar to a phone battery or any other type of rechargeable battery. For a phone, you may know how when it gets older it doesn’t stay charged as long. Well, a car battery works the same way.

As time goes on and the battery gets older, the cells get weaker. If your battery is a few years old, then it might only read out at the 12.2volt range or about eighty percent charged.

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What Voltage Is Too Low?

This probably leans to you wondering what voltage is too low then. Well, once the reading of the stored energy gets in the 10.6-volt range it is starting become too little.

You can charge your battery back up, but it might not hold that charge for long. If the battery begins growing too weak and not holding a charge, this is when you get issues with your car not starting.

Usually, a car battery does not discharge all the way to 0 before it is no good any longer. Once it is down to about 8 volts on a normal, it is time to get a new battery.

Most batteries have dates on them of how long they are expected to last. The good thing about a car battery is they last for 5-10 years and some longer, but the bad thing is they might be getting weak without you knowing it. If your battery not dead, i think you should have best car battery maintainer to charge your battery. It can can sense how much of a charge the battery needs, then the maintainer slowly sends a trickle charge to it over a period of several hours.

How To Check Voltage

How to check voltage?

How to check voltage?

Since they can start to weaken without you knowing, it is a good idea to check the voltage on occasion. You can try to check it maybe once a year when you are doing one of your oil changes.

This way you can stay on top of it and know your battery life. There are a few things you can do to test your battery and a few ways to check it.

The typical way for people at home to check their car is to use a automotive multimeter. All you do is connect each end of the probe to the connectors on the battery.

You then turn the meter on, and it will give you a readout. This is a simple method and gives you a basic idea of your batteries life, but it doesn’t give you a whole lot of information.

The other way to check your battery life is to use a battery load tester. You connect one in the same way and then rev the engine steady for 15-30 seconds.

The tester does a reading on your battery and can tell you how much volts it is holding and how well the alternator is working. It has a known resistance built into it, when you test the battery the tester puts it under ‘load’ to determine the anticipated amount of remaining life.

If you want this type of check done, you can go to most auto parts shops, and they will do it for you.

How Many Volts When Under Load

So I have let you know the typical resting voltage of your car battery and how to check the voltage, but we still have talked about how many volts are in the car battery when the car is running.

Generally, with the car going and the alternator charging the battery, it can reach 13.7-14.7 volts. This means there is a lot more voltage in the battery then is what is being advertised on it.


Now you know how many volts are in a properly charged battery. You also know a bit more how a car battery works and why it has a higher voltage than the advertised twelve.

You even know how to check your car’s battery in a primary way so you can stay on top of it and try to prevent the problem of having a dead car battery.