Run your Mac for at least two hours while it’s still plugged in. But if you own an older machine, here’s how to calibrate the battery: Fully charge your Mac’s battery. MacBooks, MacBook Pros, and MacBook Airs introduced after mid-2009 don’t require calibration. It also stores your battery data regularly, so you can check its evolution during time. Watts provides detailed information on the battery capacity, charge cycles and health. Watts monitors you battery status constantly and provides you with information and notifications to help you using your MacBook battery properly. Watts looks similar to the Mac OS battery icon menu, and provides some extra options like vertical battery icon and more. Calibration data is automatically logged, so you can see the history of your battery status. The calibration scheduling can be adjusted for your needs, and even postponed if you want.
Watts features an intuitive calibration assistant that will guide you through the process of calibrating your battery. Your battery needs to be calibrated from time to time to keep the onscreen battery time and percent display accurate, and to keep the battery operating at maximum efficiency.
It's a menu-bar app which, apart from the usual battery information (power source used, current battery charge and remaining time), provides advanced data to obtain the maximum performance of your MacBook battery. Watts provides MacBook battery management and calibration assistance.
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