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Home / Laptop / FAQ Main / Calibrate your Laptop Battery

How to Calibrate your Laptop Battery

Laptops have become an essential part of our lives. No matter your laptop usage, you never want to be cut off because of a quickly draining battery. Battery charge length varies. On average a laptop battery usually lasts about 2 hours on a full charge. This run time is a generality; it all depends on your laptops power requirements, usage and the battery itself. With laptop batteries, you will find many that contain various numbers of rechargeable "cells." The more cells a battery has, the longer it will last. This article will help you to get the most out of your laptop battery. Visit the other side links for additional information.

Video - "How to Calibrate your Laptop Battery"

Calibration - a comparison between measurements-one of known magnitude or correctness made or set with one device and another measurement made in as similar a way as possible with a second device.

Simply put, the term ‘calibrate’ means synchronizing two devices that are working together so that certain measurements are being accurately displayed. When it comes to laptops, calibrating the battery becomes necessary when the gauge that shows how much battery life remains no longer reflects a correct measurement. Such a scenario can cause problems when the laptop user thinks they have a certain amount of time left between charges, only to end up with the unfortunate case of having a dead battery long before it was anticipated. The solution?

For Windows Vista, and Windows 7 operating systems

For Windows 98, ME, 2000, and XP operating systems

 

For Windows Vista, and 7 operating systems

1. Plug the AC adapter into an electrical outlet and connect it to your laptop until battery is fully charged.
2. Once the battery is 100% charged click Start, and then Control Panel.
3. Click Power Options, and then create new power plan by clicking Create a power plan.
4. Create new plan name such as Discharge, and then click Next.
5. Select the Never On battery value for Turn off the display, and Put the computer to sleep and then click Create. This will prevent your notebook from turning off the display and entering Sleep mode to drain battery faster.
6. Allow the battery to discharge completely until the laptop turns off.
7. Plug in the AC adapter and restart your laptop.
8. Return to the Power Plan Properties dialog box and re-enter your power savings settings to the desired level.

The battery of your laptop has now been successfully calibrated, and the battery gauge will now show an accurate reading of how much power remains before needing to be recharged.

 

For Windows 98, ME, 2000, and XP operating systems

There are two ways to go about getting a laptop battery and the battery gauge back on the same page. Let's start with how to go about calibrating the battery while the laptop is NOT being used-

HOW TO CALIBRATE A BATTERY WHILE THE LAPTOP IS NOT IN USE
This method of calibration requires a complete charge and discharge cycle, so expect it to take anywhere from 1-5 hours to be successful. Be sure to do this during a period in which you won't need your laptop, as powering up the device will disrupt the process.

1. Make sure the laptop is turned completely OFF
2. Plug the AC adapter into an electrical outlet and connect it to your laptop.
3. Allow laptop battery to be fully charged.
4. Restart your laptop and start pressing the F8 key on your keyboard.
5. When the Windows Advanced Startup Menu is displayed, select the Startup in Safe Mode option.
6. Remove the AC adapter from the laptop.
7. Allow the battery to fully discharge until the laptop turns off.

HOW TO CALIBRATE A BATTERY WHILE THE LAPTOP IS IN USE

As is the case with calibrating a battery while a laptop is NOT in use, a complete charge and discharge cycle is required to successfully calibrate a battery while the laptop is IN use. Complete the steps below to calibrate a battery while the laptop is in use.

1. Plug the AC adapter into an electrical outlet and connect it to your laptop until battery is fully charged.
2. Once the battery is 100% charged (right-click the power icon in the system tray and select Open power meter to display the power status), remove the AC adapter cable from the laptop.
3. Click Start, Control Panel, and then Category View.
4. Click Power Options, Performance and Maintenance, and then Power Options.
5. On the Power Schemes tab, notice and record the default settings. You will need to reset these values later.
6. Select the Always On Power schemes value. Then select the Never value for all of the topics in the Running on batteries column. This will prevent your notebook from entering Sleep mode and allow the battery to drain faster.
7. Click Apply to accept the values and force the battery to consistently discharge. The notebook is in constant operation during the test period.
8. Allow the battery to discharge completely until the laptop turns off.
9. Plug in the AC adapter and restart your laptop.
10. Return to the Power Options Properties dialog box and re-enter your power savings settings to the desired level.

The battery of your laptop has now been successfully calibrated, and the battery gauge will now show an accurate reading of how much power remains before needing to be recharged.

Note: This method of calibration requires a complete charge and discharge cycle, so expect it to take anywhere from 1-5 hours to be successful.