Remove the battery assembly.

If you're installing a new battery, follow the calibration procedure:

Charge it to 100%, and keep charging it for at least 2 more hours.

Unplug and use it normally to drain the battery.

When you see the low battery warning, save your work, and keep your laptop on until it goes to sleep due to low battery.

Wait at least 5 hours, then charge your laptop uninterrupted to 100%.