How to Calibrate Your MacBook Battery (4 Steps)

Plug in your MacBook and give it a full charge. You can tell if your MacBook is fully charged when the green LED light on your power adapter changes from amber to green. When the LED is Green, your battery is at full charge. Leave the MacBook plugged in and charging for an extra two hours past the point when the LED turns Green.
Run your battery down and discharge it completely. Disconnect the power adapter and use your Mac until the battery is fully discharged. You will see a low battery warning on your screen, but keep using your MacBook until the battery completely runs out and the machine puts itself to sleep.
Close the laptop lid and let your Mac sleep, without power connected, for at least 5 hours. Letting your MacBook rest overnight is a good rule of thumb.
After letting the computer rest for 5 hours or longer, plug in your MacBook to the power supply and leave it connected until the computer is fully charged. It’s OK to use your MacBook while the battery charges. When the charge is completed, you’ve successfully completed recalibration of your MacBook battery.
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