How to Test Laptop Battery With Multimeter

The main reason to test your laptop battery with a multimeter is to determine if it still functions properly. A fully charged and healthy battery should register a voltage of around 10-11 volts for lithium-ion batteries or 12-13 volts for other types of batteries. If the voltage exceeds this, the battery may be damaged and require replacement.

How to Test Laptop Battery With Multimeter

Using a multimeter to test your laptop battery is an effective way to identify any potential issues with the device. A multimeter can accurately measure the voltage and amperage of the battery, which will indicate its general health. This article discusses how to use a multimeter safely on a laptop battery, along with some tips on troubleshooting any faults that you may find. In this blog post, You will learn how to test laptop battery with multimeter.

Step-by-step Instructions for How to Test Laptop Battery With Multimeter

Step 1: Inspect the Connections

Before testing the laptop battery using a multimeter, check that all the connections are in place. Ensure all the cables connecting your laptop to its power source are properly connected.

Step 2: Prepare Your Multimeter

To prepare your multimeter for testing, make sure it is set to DC voltage, and you select the appropriate range setting. If needed, also ensure that the battery is at full charge. If your laptop is plugged into a power source, turn off the source and unplug it from the wall. This will ensure you get an accurate reading of your laptop battery’s voltage.

Step 3: Connect the Multimeter Probe Leads

Connect the black probe to your laptop battery’s negative terminal and the red probe to the positive terminal. Make sure that both probes are firmly connected. Turn on your multimeter and check for voltage. If it’s at 0 volts or below, your battery is bad and needs to be replaced.

Turn on Your Multimeter and Check for Voltage

Step 4: Calculate Battery Capacity

Once you have confirmed that the voltage of your laptop battery is good, you can calculate its capacity by dividing the measured voltage by the rated voltage. For example, if the measured voltage is 11.1 volts and the rated voltage is 10.8 volts, the capacity of your laptop battery is 103%.

Step 5: Confirm Battery Capacity

To confirm the calculated capacity, you can use your multimeter to measure the internal resistance within the battery. This will help you determine if the battery can hold a charge properly. Next, you can use your multimeter to measure the discharge rate of your laptop battery. This will help you determine how much power it can provide over time.

Step 6: Check Temperature

Finally, check the temperature of your laptop battery with a thermometer while it is in operation. A healthy battery should remain at a steady temperature during usage. Once you have completed all the necessary tests, recharge your laptop battery for optimal performance.

These steps can help you accurately test a laptop battery using a multimeter and determine its capacity and discharge rate. Before working with any type of electrical components, always ensure that you read and follow the manufacturer’s instructions for safety.

Safety Tips for How to Test Laptop Battery With Multimeter

  1. Always wear safety glasses and protective clothing when working with a multimeter.
  2. Ensure your laptop is unplugged and the battery has been removed before testing the laptop battery with a multimeter.
  3. Be aware of any voltage present in your area before using a multimeter for these tests to avoid electric shock or damage to the laptop or meter.
  4. Always turn off your multimeter before connecting it to the laptop to avoid short circuits or electric shock.
  5. Avoid contact with exposed wires and components when using a multimeter on a laptop battery.
  6. Never attempt to repair or replace any laptop’s battery or power system components without consulting an authorized technician first. This can cause serious damage to your laptop and even electric shock.
Wear Safety Glasses and Protective Clothing

These safety tips will help protect you from potentially hazardous situations when testing laptop batteries with a multimeter. Taking the time to prepare for this task properly and understanding the risks associated with handling electrical components can save you time, money, and hassle.

How Do You Connect the Multimeter to the Laptop Battery?

Once you have obtained a multimeter, the next step is to connect it to the laptop battery. Start by setting the multimeter to DCV (direct current voltage). After that, open the back of your laptop and locate its battery. Disconnect the negative lead from it and attach one end of the red probe from the multimeter to this terminal while attaching the black probe to the remaining terminal. You can see the voltage output on the multimeter meter screen.

You must wear protective gear such as goggles and gloves when working with any electronics, including laptop batteries. This will help protect you from any potential electric shock or burn risks. If the voltage output shows a positive reading, the battery is working. A negative reading may mean a faulty battery, or you could have misconnected it. In any case, taking your laptop to an authorized service center for further investigation and repair is advisable.

How Do You Interpret the Readings From Your Multimeter Test of the Laptop Battery?

It is important to read and interpret the results accurately when testing the laptop battery with a multimeter. The most common readings are voltage, amperage, and resistance. Voltage measures the potential energy between two points in an electrical system. With your multimeter, you can measure the voltage of your laptop battery. It should read either 3.7V or 7.4V, depending on the battery type.

Testing the Laptop Battery With a Multimeter

Amperage measures the rate at which electric current flows through a conductor. When testing your laptop battery with a multimeter, you should watch for amperage readings that are too low or too high, indicating potential issues with the battery. Resistance measures the opposition of electrical current flow. Resistance values will vary for different types of laptop batteries, so it is important to look up the correct value for your model before testing with a multimeter.

What is the Best Way to Store a Laptop Battery When It is Not in Use?

Storing a laptop battery correctly is key to preserving its life and condition. If you’re not using your laptop often, store the battery in a cool, dry place away from direct heat or sunlight. It’s also important to charge the battery every six months, even if you plan to wait to use it. 

Doing this ensures that the battery can hold a charge when needed. You should also avoid overcharging your laptop battery and keep it at or below 50% capacity whenever possible. By following these simple steps, you can ensure that your laptop’s battery remains in peak condition, giving you reliable power when needed.

Are Any Risks Associated With Using a Multimeter to Test the Condition of Your Laptop Battery?

Yes, certain risks are involved when using a multimeter to test the condition of your laptop battery. You should never try to use a multimeter on a laptop that is still plugged in or connected to any power source, as this may cause an electrical short or other damage. 

Additionally, you should take extra care to ensure that the probes do not come into contact with any exposed metal on the laptop or battery, as this could also result in an electrical shock. Finally, you should avoid testing a laptop battery if it leaks or is damaged. In these cases, it is best to seek professional help from a qualified technician.

Is There Any Special Maintenance That Needs to Be Done on a Laptop Battery to Ensure Its Long Life?

Yes, taking care of your laptop battery is important to maximize its lifespan. This includes unplugging the power cord when not in use and avoiding extreme temperatures as much as possible. Calibrating your laptop battery at least once every few months is also a good idea. Calibrating your laptop battery involves draining it completely and recharging it fully.

Unplugging the Power Cord When Not in Use

This helps to ensure that the battery is working correctly and that your laptop or other device reads accurate data from the battery gauge. Testing a laptop battery with a multimeter can also help you assess its condition and ensure it remains in good shape. To test your laptop battery with a multimeter, begin by setting the multimeter to the DC voltage setting. Then, remove your laptop battery from the device and connect the multimeter probes to the appropriate terminals on the battery.


In conclusion, testing a laptop battery with a multimeter is relatively easy but requires some technical know-how. It is important to ensure safety before you disconnect the power before beginning your testing procedure. After connecting the multimeter to the laptop’s terminal, it is important to check for any signs of damage or corrosion on the terminals and battery cells. 

If found, they should be cleaned and replaced. You can then test the battery’s voltage to determine if it is still in working condition. If not, you may need to purchase a new one or look into other alternatives, such as refurbished batteries. Reading this post has helped you learn how to test laptop battery with multimeter. Make sure the safety precautions are carried out in the order listed.

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Enrique Howard

Hi, I am Enrique. I started my professional life as a handyman and did a lot of external and internal repair of home and office with a little bit of electric and plumbing support. I have extensive experience in tools testing such as drilling, turning, milling, and non-conventional machining like EDM. So let me help you on your journey towards becoming an enlightened DIYer with amazing tools that you can use on your project.

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