How to Calibrate My Laptop Battery

by Kallie Johnson

Calibrating a laptop battery can increase or restore its efficiency. This should be done prior to first use, and again when you notice battery efficiency decreasing. Calibrating a battery experiencing decreased efficiency is most effective on nickel-cadmium (NiCad) and nickel-metal hydride (NiMH) batteries. You can still calibrate a lithium ion (Li-ion) battery, though the process is a bit different. Calibrating involves draining and recharging the battery. This process is also referred to as conditioning.

Ni-MH and NiCad Batteries

Remove the AC adapter from your laptop by gently pulling it out.

Power on your laptop. Allow it to run on battery power until the battery is drained and the laptop shuts down.

Plug the AC adapter into an electrical outlet. Insert the appropriate end into the your laptop.

Leave the AC adapter plugged into the laptop for eight hours to fully charge the battery. Do not use the laptop during this time.

Remove the AC adapter, turn the laptop on and allow the computer to run on battery power until the battery is drained. Repeat this process until the battery has been drained and recharged 3 to 5 times.

Lithium Ion Batteries

Remove the AC adapter from the laptop.

Turn on the laptop. Allow it to run on battery power until the battery is drained to 40 percent of capacity. Hover your mouse over the battery icon in the lower right corner of your toolbar. This will display how much life the battery still possesses.

Remove the battery from the laptop. The battery is located on the underside of your computer. Slide the locking mechanism to the side to unlock or release the battery. Once released, the battery will either slide out or can be lifted out of the bay. Store the battery until you are ready to use it.

Place the battery back into the battery bay when you are ready to use it.

Plug the AC adapter into the side of the laptop. Allow the adapter to fully charge the battery prior to use.

About the Author

Kallie Johnson began her writing career in 2009, contributing to various online publications. She holds a Bachelor of Arts in English from the University of Nevada, Las Vegas. She enjoys writing home and garden topics and considers herself an expert on do-it-yourself home improvement topics.

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Photo Credits

  • photo_camera Laptop image by Marek Kosmal from