How To Test A Battery With A Multimeter

Tizi V.

November 23, 2021

Battery

CONTENTS

1.0 Introduction “What is Multimeter”?

2.0 Complete guide how to test battery with multimeter

2.1 How to test Battery voltage with multimeter

2.2 How to test Battery Amps with multimeter

3.0 How to test car battery with multimeter

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

3.2 How long should a car battery last?

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

3.4 What causes battery failure?

3.5 Using a multimeter to test a car battery

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

1.0 Introduction “What is Multimeter”?

Multimeter is an electronic device, which has become one of the commonly used appliances in routine life. The basic purpose of multimeter is to measure different electrical properties like electric current (ampere), voltage (volts), electric resistance (ohms), continuity etc. Multimeters which are easily available in the market are of two types:

 • Analog Multimeter
 • Digital Multimeter

The basic difference between the two is that, analog multimeter has a moving pointer for displaying the values, while digital multimeter displays the numeric values. Digital multimeter is cheap, easy to use and more precise than the analog multimeter. If you are looking for reliable Digital Multimeters at reasonable price, click here.

2.0 How to test battery with multimeter

When it comes to the common uses of multimeter, first one that comes in mind is to test battery. Mostly we all came across this problem, when batteries in our TV remote/keyboards/mice etc does not work properly. And without knowing our better condition we mostly throw them. This article will describe in a simple way how use Kaiweets KM601 Digital Multimeter to test battery whether it is worth to keep the battery or not.

The basic purpose of testing a battery is to check whether battery will provide enough voltage to the load or not as well as to check the internal resistant of a battery/cell. 

To test simple 9-volt battery (AA/AAA) which used commonly in TV remote, in this article we’ll measure its voltage as well as current with the help of multimeter.

2.1 How to test Battery voltage with multimeter

 • When testing a battery voltage, turn on multimeter and move the switch dial to the DCV measurement, as we are measuring the voltage of a battery which produce DC power.
 • Make sure voltage in multimeter is far above as compared to the battery voltage, which is 9-volts. Most of the multimeter has an increment of 20 in DC area, move selector dial to that setting of 20 volts.
 • When battery is in front of you, place the red probe of the multimeter on the nipple side of the battery (+) and black probe on the other side of the battery which is flat (-).
 • Make sure probes are properly placed and measured the reading on the multimeter
 • Our reading comes about 8.5 volts as cell is slightly used.

Note: If multimeter display shows less than 1 voltage measurement, then battery is dead and its time to replace this with the new one.

This is an acceptable common method used for the measurement of voltage of a battery with the help of multimeter worldwide.

Now we’ll measure the current in a battery with the help of multimeter almost in a similar way, as we measured the voltage.

2.2 How to test Battery Amps with multimeter

 • Turn on the multimeter, turn the dial to DC function and keep it around 200 mAh (milliampere-hour). As battery which we are testing will produce an amperage of 100 mAh.
 • Place the test probes of multimeter around the battery as we discussed earlier: place the red probe of the multimeter on the nipple side of the battery (+) and black probe on the other side of the battery which is flat (-).
 • Make sure multimeter probes are properly placed and check the reading on the multimeter.
 • If the readings fluctuate around 100 mAh, then our battery is fine and will provide enough power to run any small device like TV remote control or mice.

If the battery voltage is half of its initial rating, then its better to replace it, because when battery reaches midpoint of its rating, it drains more quickly.

3.0 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.

3.1 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

3.2 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.

3.3 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.

3.4 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

3.5 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.

3.6 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.

Check the best reviews of our products at kaiweets.com

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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.