How do I discharge my laptop battery?

Allow the laptop computer battery to drain completely. To do this, disable all power management utilities or use the computer until it powers itself down. Once drained, recharge the battery to 100%. Doing so every few months helps extend the life of your portable computer battery.

If your laptop uses a Li-ion battery, do not discharge your laptops battery. Doing any of the steps below may decrease the battery’s life and discharging is not needed for these batteries.

Refresh battery though BIOS setup

Some laptop manufactures also include a battery refresh through the BIOS setup.

  • How to enter and exit the BIOS or CMOS setup.

Old laptop battery deep discharge

Older batteries can be discharged using a deep discharge debug routine found on our debug page.

  • How long should I charge my laptop battery?
  • See our battery definition for further information and related links.
  • Computer and laptop battery help and support.