How to Calibrate the MacBook Battery

The battery for the iBook and the MacBook has a microchip inside the battery that controls the charge and discharge process of the unit. The battery needs to be recalibrated to keep the on screen display of the percentage and time accurate.
You should perform this function when you first get the unit and every two or three months from then on. If you use the system mostly on AC, you may need to perform this monthly.

1. Plug in the power adapter and fully charge you MacBook. Watching the indicator lights to make sure you have a full charge.
2. Disconnect the AC power and use the MacBook till you receive the warning about the low battery.
3. Continue to use the unit until the system until it goes to sleep.
4. Connect the AC power adapter and fully recharge the battery again. This will calibrate the battery. One full charge discharge and full recharge will calibrate the battery.

NOTE: Some MacBook Pro's may need to have the battery rest for a couple of hours before performing the calibration steps.