How to test a laptop battery with a multimeter? [2023 Guide]

As a laptop user, you must be aware of the importance of the battery’s health, which plays a vital role in the overall productivity of your work.

However, checking the efficiency of the laptop’s battery is a technical process that not all users are familiar with. Moreover, the battery of a laptop wears out faster than other components, making it necessary to know when to replace it.

In this article, we will guide you on how to test your laptop battery’s health using a multimeter. Let’s jump into it. But wait here is a quick note.


The battery is an essential component of a laptop, and its health directly impacts productivity. However, the efficiency of a laptop battery wears out faster than other laptop components. As a result, it is crucial to know when to replace the battery and how to check its health regularly.

Testing a laptop battery’s health is a technical process, and not everyone knows how to do it. One effective way to test a laptop battery’s health is by using a multimeter. So here is a step by step guide.

Step 1: Charge Your Laptop Battery

To begin checking the battery capacity of your laptop, the first step is to charge it fully using a reliable charger. It’s important to ensure that the charger you’re using is functioning correctly to avoid any potential issues with the battery.

Charging your laptop battery is a vital step in the process of determining its capacity. A fully charged battery will give you the most accurate reading of its current capacity.

Depending on the type of battery and the age of your laptop, it may take several hours to fully charge the battery.

It’s recommended to leave your laptop plugged in until the battery is fully charged to get the most precise reading of its current capacity.

In some cases, your laptop may have a built-in tool to monitor the battery capacity.

This tool can provide you with an estimate of how long your battery will last on a single charge. However, to get the most accurate reading of your laptop’s battery capacity, it’s best to charge it fully before proceeding with any further tests or diagnostics.

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Step 2: Turn the Laptop Off and Remove the Battery

After fully charging your laptop battery, the next step is to turn off your laptop and unplug it from the charger.

To accurately test your battery capacity, you’ll need to remove the battery from your laptop. The voltage of your laptop battery is usually printed on the battery itself, so you’ll want to check this information before proceeding with any tests.

To remove the battery, check your laptop’s user manual for specific instructions.

In most cases, you’ll need to slide a button or switch to release the battery from its compartment. Once you’ve removed the battery, check the voltage information printed on it.

Laptop batteries typically have a voltage range of 9.6 V, 10.8 V, 11.1 V, 14.4 V, or 14.8 V, but this may vary depending on the model of your laptop.

It’s essential to pay attention to the voltage range of your laptop battery as it will determine the type of test you can perform to check its capacity.

Testing your laptop battery capacity requires the use of a multimeter, which measures the voltage output of your battery.

By comparing the measured voltage with the voltage printed on your battery, you can determine whether your battery is still holding a charge or has deteriorated over time.

Step 3: Locate the Connector

The connector on your laptop battery is the point where it connects to your device, and it’s important to locate it before attempting to remove the battery.

You’ll typically find the connector located near the center of the battery’s side. It’s about an inch in length and looks similar to the exhaust fan grating on your laptop, with a series of five narrow and identical slots.

It’s important to take note of the connector’s design as it can help you correctly orientate the battery when you need to reinsert it.

Additionally, the negative and positive terminals of your battery are located at the outermost slots of the connector.

These terminals are vital as they’re responsible for delivering power to your device, and any damage or corrosion can cause issues with your battery life or even damage your device.

If you’re unsure about locating the connector or the battery terminals, it’s best to refer to your laptop’s user manual for guidance.

Following the manufacturer’s guidelines can help you avoid damaging your device and ensure the correct handling of your laptop battery.

Overall, understanding the location of your battery’s connector and terminals can help you handle your device safely and correctly.

Step 4: Turn On the Multimeter and Set the Voltage

To begin testing your laptop battery’s voltage, you’ll need to use a multimeter.

First, turn on the multimeter and set it to direct current voltage mode. This mode will enable you to measure the voltage output of your laptop battery accurately.

Next, set the voltage of your multimeter to 20 V or a voltage close to it, where the lines indicate direct current voltage near the voltage setting.

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The voltage setting of your multimeter will be denoted by “V,” while alternative current voltage is represented by wavy lines.

It’s important to set the voltage range correctly on your multimeter to get accurate results when testing your laptop battery.

If you set the voltage too high, you risk damaging your device, while setting it too low may result in inaccurate readings.

Step 5: Insert the Prong of the Multimeter into the Slot of the Connector

To test your laptop battery’s voltage accurately, you’ll need to insert the two prongs of your multimeter into the slots of the connector.

It’s essential to ensure that the prongs are accurately connected to the metallic part of the slots, as this will ensure accurate voltage readings.

When inserting the prongs into the slots, it doesn’t matter whether you match the positive and negative terminals or not. The multimeter will measure the voltage output regardless of the orientation of the prongs.

It’s important to handle your laptop battery with care and avoid causing any damage to its terminals or connector when inserting the prongs

Step 6: Observe the Appeared Reading on Multimeter

Once you’ve connected the slots and prongs of your multimeter to your laptop battery, you should see a reading on the device’s display. This reading will help you determine the battery’s voltage output and overall health.

If your laptop battery is healthy and can last longer, the reading on the multimeter should be very close to the voltage reading already printed on the battery. This indicates that your battery is performing as expected and should be able to power your device for an extended period.

However, if the reading on the multimeter is significantly lower than the printed voltage on the battery, it may indicate that your battery is in poor health and needs replacing

. In this case, it’s best to seek guidance from a professional technician or refer to your laptop’s user manual for further troubleshooting steps.

It’s essential to note that a multimeter reading can only provide a general indication of your laptop battery’s health and performance. Other factors, such as the age of the battery and usage patterns, can also impact its overall health and longevity.

By regularly testing your laptop battery’s voltage and following the correct procedures, you can help extend its lifespan and ensure that your device continues to operate as expected.

Step 7: Compare the Battery Voltage

To determine if your laptop battery is in good health, it’s essential to compare its voltage when fully charged to the voltage after discharging almost 70 to 80% of the battery.

This will give you a better idea of how well your battery is performing and whether it needs to be replaced.

If your laptop battery suddenly drops to zero when discharging, it’s a clear indication that your battery has worn out and needs to be replaced.

This is because a healthy battery should gradually lose its charge over time and not suddenly drop to zero.

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It’s also worth noting that the voltage readings on your laptop battery can vary depending on a range of factors, including usage patterns, temperature, and age.

As such, it’s essential to use voltage readings as a general guide and to seek guidance from a professional technician or refer to your laptop’s user manual for more detailed troubleshooting steps.

By regularly testing your laptop battery’s voltage and comparing its performance to industry standards, you can help ensure that your device continues to operate as expected and that your battery performs optimally over time.

FAQ’s: How to test a laptop battery with a multimeter

Can I test my laptop battery with a multimeter without removing it from the laptop?

No, you have to remove the battery from the laptop to test it with a multimeter because you cannot test it without the laptop’s voltage being printed on the battery.

Can I test my laptop battery with a multimeter while it is still connected to the charger?

No, you have to unplug the laptop from the charger and turn off your laptop to remove the battery before testing it with a multimeter.

What if I do not have a multimeter to test my laptop battery?

You can take your laptop to a professional technician to have your battery tested, or you can buy a multimeter, which is an inexpensive tool that can be used for various purposes.

Can I use a voltmeter instead of a multimeter to test my laptop battery?

Yes, you can use a voltmeter instead of a multimeter to test your laptop battery because a voltmeter is a type of multimeter that measures voltage.

How often should I test my laptop battery with a multimeter?

You should test your laptop battery with a multimeter once every six months to ensure that it is working efficiently and that there are no issues with it.

Conclusion: How to test a laptop battery with a multimeter

checking the efficiency and health of your laptop battery is crucial for ensuring the productivity of your work. Although it may seem like a technical process, testing your battery with a multimeter can be done easily and conveniently by following the steps outlined above.

By charging your laptop battery, turning off your laptop and removing the battery, locating the connector, setting the voltage on the multimeter, inserting the prong of the multimeter into the slot of the connector, and observing the appeared reading on the multimeter, you can determine whether your battery is healthy or not.

If your battery is healthy, it will show a reading on the multimeter that is very close to the reading already printed on the battery.

On the other hand, if your battery suddenly drops to zero, it is a sign that your battery has worn out, and you need to replace it to ensure the productivity of your work.

David Bill Founder Of Laptops Ideas

Welcome to Laptops Ideas, a leading online resource for finding the latest and best ideas about laptops available in the marketplace. Founded by David Bill, an extreme laptop lover.

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