Sep 11, 2012

How do you recalibrate the battery in a MacBook?

I haven't been able to fully charge my battery on my MacBook, and I thought recalibrating the battery might help. I'm not sure of the exact steps though. Anyone know off the top of their head how to do it?



It's super simple.  Direct from the horse's mouth, aka Apple Support:


"1. Plug in the power adapter and fully charge your PowerBook's battery until the light ring or LED on the power adapter plug changes to green and the onscreen meter in the menu bar indicates that the battery is fully charged.

2. Allow the battery to rest in the fully charged state for at least two hours. You may use your computer during this time as long as the adapter is plugged in.

3. Disconnect the power adapter while the computer still on and start running the computer off battery power. You may use your computer during this time. When your battery gets low, the low battery warning dialog appears on the screen.

4. At this point, save your work.  Continue to use your computer; when the battery gets very low, the computer will automatically go to sleep.

5. Turn off the computer or allow it to sleep for five hours or more.

6. Connect the power adapter and leave it connected until the battery is fully charged again."  




This might help:

Apple Portables: Calibrating your computer's battery for best performance

"The battery has an internal microprocessor that provides an estimate of the amount of energy in the battery as it charges and discharges. The battery needs to be recalibrated from time to time to keep the onscreen battery time and percent display accurate and to keep the battery operating at maximum efficiency. You should perform this procedure when you first use your computer and then every few months after that. If you normally leave your Apple portable computer connected to AC power and very rarely use it on battery power you may want to perform this process once a month. The website www.apple.com/batteries has more helpful information regarding batteries and offers an iCal calendar to remind you to calibrate your battery. "
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