Calibrating Laptop Batteries – Introduction and How-To

Have you ever had your battery go from half full to almost dead in a short period of time, or you plugged in the charger and unplugged only to find out that you thought 100% was 95%. This happens when your laptop battery reports incorrect charging information. This means your battery may not be fully calibrated. Therefore, we need to understand what is meant by battery calibration and how to calibrate the battery. Let’s take a look at it in detail!

What is laptop battery calibration?
There is no reliable way to find the exact capacity of a battery at a given time. The only reliable way to determine it is to fully charge the battery, then fully discharge it and measure. So this is one way to calibrate the battery. Battery calibration is a method of resetting the battery system so that it provides accurate readings.

Manufacturers generally recommend that users calibrate batteries every 2-3 months to keep battery readings accurate. Failure to accurately calibrate the battery can cause the laptop to freeze suddenly without warning.

How do you calibrate your laptop battery?
The process of calibrating a laptop battery is simple. You can charge the battery to 100% using this most straightforward method. Then, let the battery run from 100% to about 0%. The battery’s power meter will measure the duration of the battery and give you a proper idea of ​​how much capacity the battery has left.

Some laptop manufacturers have added a utility that can calibrate the battery for you. These tools ensure your laptop has a full battery, disable power management settings and allow the battery to drain. It allows the battery’s internal circuitry to know how long the battery has been in use. Check the manufacturer’s website for information on using any utilities they offer. You can also manually calibrate the battery using the BIOS or third-party software. Let’s see how to calibrate the battery using these methods.

Manually calibrate the battery.
It’s best to use any of the included utilities or follow the instructions on your laptop. The necessary process is simple:

1. Make sure the battery is fully charged – i.e. fully charged to 100%.
2. Leave the battery on for at least 2 hours to keep the computer powered on. This will ensure that the battery is cold during charging and not still hot. You’re free to use your computer while it’s plugged in, but be sure to check to make sure it’s not getting hot.
3. Access your computer’s administrative settings and set it to automatically hibernate at 5% battery power. To find these options, head to Control Panel > Hardware and Sound > Power Options > Change Plan Settings > Change Advanced Power Settings. Then go to the “Critical Battery Operations” and “Critical Battery Level” options in the “Battery” category.
4. Unplug the charger and let your laptop run and discharge until it automatically sleeps. When this happens, you can continue to use your computer.

If you want to calibrate your battery when you’re not using your computer, make sure your battery isn’t set to automatically hibernate, hibernate, or turn off its display when idle. If your battery goes into power saving mode when you are away, it will save power and not discharge properly. Visit Control Panel > Hardware and Sound > Power Options > Change Plan Settings for these options.

1. Let the computer stand for about five hours after automatic shutdown or hibernation.
2. Plug your computer back into the power outlet and charge it to 100%. You can continue to use your computer in the usual way while charging.
3. Make sure any power management settings are fine on their average.
   Your laptop should now offer more accurate battery life than before. It won’t shut you down unexpectedly and will give you a better idea of ​​how much battery power you have at a given time.

Calibrate Laptop Battery Using BIOS
Your laptop must have a built-in battery calibration routine (in its BIOS) to give you this method. Please follow the steps below:

1. Turn off your laptop, then turn it back on.
2. Press the “F2” key in the boot menu to enter the BIOS.
3. Use the keyboard cursor keys to select the “Power” menu.
4. Navigate to “Start Battery Calibration” and hit the “Enter” key (this will change your screen background to blue). Start battery calibration
5. Follow the commands on the screen and plug in your laptop charger.
6. After the laptop is fully charged (100%), disconnect the charger.
7. Let the battery drain (discharge) from 100% to 0%; until it shuts down automatically.
8. Connect the charger (do not start the system while charging).
9. When fully charged, the calibration procedure is complete.
10. You can then disconnect the charger and restart the system.

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