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How To Test A Battery With A Multimeter

Tizi V.

November 23, 2021

Battery

CONTENTS

1.0 Signs that a battery isn't good

2.0 How to Check Battery Voltage with a Multimeter

3.0 How to Check Battery Amperage with a Multimeter?

4.0 How to test car battery with multimeter

5.0 Conclusion

A multimeter is an essential tool for testing electronic components, such as batteries. In this article, we'll learn how to test a battery with a multimeter. First, let's learn a little bit about how batteries work. Batteries store electrical energy in chemical form. When the battery is connected to an electronic device, the chemical reaction is reversed and the electrical energy is released. The capacity of a battery is measured in milliamp hours (mAh). This is the amount of current that the battery can deliver for one hour. For example, a 3,000 mAh battery can deliver 3 amps for one hour, or 1 amp for three hours. Now that we know how batteries work, let's learn how to test them with a multimeter.

1.0 Signs that a battery isn't good

1. Frequent starting problems: If your car battery is having trouble starting your engine, it's a good indication that the battery itself is nearing the end of its life.
2. dim headlights: Headlights that seem dimmer than usual (or take longer to brighten when first turned on) could be another sign that your battery is on its last legs.
3. Slow cranking: If it takes longer than normal for your engine to turn over when you try to start it, that's another symptom of a failing battery.
4. Check Engine light is on: In some cars, the Check Engine light will come on if the battery voltage is low. So if you see this light illuminated on your dash, it's a good idea to get your battery checked out.
5. Swelling or bulging battery case: This is a sign that the battery is overcharging, which can shorten its lifespan.
If you notice any of these signs, it's time to have your battery tested by a professional. If it does need to be replaced, make sure to get a high-quality battery from a reputable source.

2.0 How to Check Battery Voltage with a Multimeter

1. Start by turning the multimeter on and setting it to the DC voltage setting.
2. Next, touch the black multimeter lead to the negative terminal of the battery.
3. Then, touch the red lead to the positive terminal of the battery.
4. Finally, read the number that appears on the multimeter display. This is the voltage of your battery. 
5. If your battery is 12 volts or higher, it is considered healthy. If it is below 12 volts, it may need to be replaced.

You can use a multimeter to test the voltage of your car battery at home. This is a simple and easy way to check if your battery is healthy or needs to be replaced. Follow the steps above to get an accurate reading of your battery's voltage.
It is also important to note that the voltage of a battery can vary depending on its state of charge. A battery that is fully charged will have a higher voltage than one that is only partially charged.
Knowing how to check the voltage of a battery with a multimeter can be helpful in troubleshooting electrical problems. It can also help you determine if a battery is truly dead or if it just needs to be recharged.

3.0 How to Check Battery Amperage with a Multimeter

Checking the amperage of your battery is important in order to ensure that it is able to provide enough power to start your vehicle. A multimeter is an essential tool for checking the amperage of your battery.

In order to check the battery amperage with a multimeter, you will need the following tools:

● A multimeter
● A set of jumper cables
● A 12 volt test light

First, you will need to connect the positive lead of the multimeter to the positive terminal of the battery. Next, you will need to connect the negative lead of the multimeter to the negative terminal of the battery. Finally, you will need to turn on the multimeter and set it to the amperage setting.
The multimeter will then display the current amperage of the battery. If the battery is able to provide enough power to start your vehicle, the amperage should be around 12 volts. If the amperage is lower than 12 volts, it may not be able to provide enough power to start your vehicle.
You can also use a 12 volt test light to check the amperage of your battery. To do this, you will need to connect the positive lead of the test light to the positive terminal of the battery. Next, you will need to touch the negative lead of the test light to the negative terminal of the battery. If the test light lights up, it means that the battery has enough power to start your vehicle.
If you are still unsure about the condition of your battery, it is always best to consult with a professional electrician. A qualified mechanic or auto electrician will be able to properly diagnose the issue and recommend the best course of action.

4.0 How to test car battery with multimeter

This article will describe how to use a multimeter to test the battery on your car to see if it's bad.

4.1 How does someone know if its car battery is bad?

Symptoms which come across the bad battery or bad alternator are following:

 • Engines cranks slowly or not crank at all
 • Battery light is on the dashboard
 • There's quacking when you turn the engine on but the engine doesn't start
 • The interior lights or headlights seem weak or dim
 • Engine just clicks

4.2 How long should a car battery last?

Car batteries are warrantied to last for about years. But only 30% of the batteries that are sold today reach that four-year mark. If you're having problems with your battery, make sure your connections aren't corroded.

4.3 How many volts should a car have when fully charged?

Different cars have different battery ratings, mostly which come in the market are around 15 to 20 volts D/C.

4.4 What causes battery failure?

If battery fails or die while driving, car will stop running. Following factors causes battery failure:

 • Leaving headlights on or may be leaving interior lights on
 • Using accessories like radio for a long time when car is not running
 • Excessive short drives
 • Defective alternator
 • Corroded or loose battery cables
 • Low electrolyte fluid
 • Extreme temperature

4.5 Using a multimeter to test a car battery

One simple way for checking battery is going bad or not is put key in the ignition, turn it to the run position. In routine life people test the voltage of the car battery through the battery light. So, if that blows out, you won't be able to tell if your battery's bad or not. And a lot of times that could trigger another light like a check gauges light. So, what should happen is when you start the car, it'll shut off. If it shuts off, then your battery's good.

To test the car battery with Kaiweets KM601 digital multimeter (click here for more info), perform the following steps:

 • Turn the headlights on for about two minutes. This will get rid of any surface charge the battery may have.
 • Turn on multimeter set the voltage to 20 volts or something above 15 volts.
 • Two minutes later, shut the lights off.
 • Make sure battery terminals are cleaned properly.
 • Place the red probe of the multimeter on the red terminal of the battery (+) and black probe on the other terminal of the battery which is black (-).
 • Multimeter LCD displays a reading of 12.85 volts, which is okay. 

Now just because this is a good voltage doesn't mean your battery's good. The battery could be holding a charge but doesn't have the cold cranking amps to start the car, that's what we're going to test right now.

4.6 How to test cold cranking Amps of a car battery with multimeter?

We will attach the probes of a multimeter with the car battery properly and this time we are going to start ignition.

Battery voltage shouldn't drop below 10 volts, if drops below 10 volts, then we have a battery problem.

We had observed that voltage dropped down about 10 volts and then it popped back up at 14 volts. That's because the alternator is charging the battery. So, we had checked out battery has enough cranking amps and is in good condition.

If your battery starting to go below 5 volts, your battery's garbage, you need to buy a new one.

We hope this article will help you how to test voltage or electric current of a simple AA cell or the car battery.

5.0 Conclusion

In conclusion, anyone can perform a multimeter test on a battery because it is so straightforward.
The condition of your battery and whether or not it needs to be replaced can be easily ascertained by following the steps outlined in this article. You can use a voltmeter or an ammeter to check the battery's voltage and current if you don't have a multimeter. But these techniques aren't as reliable as a multimeter and could end up giving you wrong result. Therefore, it's always best to use a multimeter when testing a battery.

Check the best reviews of our products at kaiweets.com

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What to Look for in a Self Leveling Laser Level

Before we look at our individual choices, let’s talk about self-leveling lasers, and what you should expect. There are a number of factors to consider, and manufacturers offer all kinds of bells and whistles. In that sense, every laser level is unique. But there are also some features you should be looking at in every laser level. You need to consider the accuracy, the type of laser light, the laser’s range, and the quality of the build. Let’s take a look at each of these.

Accuracy

Before we look at our individual choices, let’s talk about self-leveling lasers, and what you should expect. There are a number of factors to consider, and manufacturers offer all kinds of bells and whistles. In that sense, every laser level is unique. But there are also some features you should be looking at in every laser level. You need to consider the accuracy, the type of laser light, the laser’s range, and the quality of the build. Let’s take a look at each of these.

Laser Color and Brightness

Most laser levels are made with either red or green lasers. This is because those wavelengths are the ones that are most visible to the human eye. But even the most easily visible laser can be hard to see in the outdoors. This is because the sun is 10 times as bright as ordinary interior light. You don’t notice it when you step outside, because your eyes adjust in a few seconds. But the sheer intensity of the sunlight will block out all but the brightest laser levels. And even levels that work outdoors will have much shorter range than they will indoors. For this reason, some levels come with white or reflective panels to project the laser onto.

Laser Range

Next, you need to think about the range of the laser light. This will be a combination of brightness and accuracy. At the point where the beam is no longer visible, or wildly inaccurate, it can no longer be used. Professional-grade outdoor levels will be effective to at least 100 feet, and sometimes as far as 300 feet. Indoor levels will typically have a much shorter range, since a longer range is usually pointless.

Quality of Engineering

Finally, look at the overall quality of the build. Is the level water-resistant? Is it designed for tripod mounting? What are your other mounting options? Is there a carrying case? Can the level withstand a drop? These types of considerations are particularly important when you’re using your level outdoors. However, even an indoor level is subject to abuse, and will benefit from good mounting options.