Calibrate MacBook Battery

1. Plug MagSafe Power Adapter until fully charge (Battery icon = Charged and the charger’s connector light turns green).
2. Keep the laptop plugged in for another two hours.
3. Disconnect your laptop from power. Use it until it falls asleep from low battery.
4. Turn off the laptop and do not use it for about five hours.
5. Plug your laptop back in and let it fully charge.