Why do I need to calibrate my Macbook Battery?
Once upon a time, if you purchased a new a Mac laptop, or bought a spare battery, you needed to perform a battery calibration to obtain the best performance out of your battery. Simply put, this meant first charging your battery completely or using your Mac with a power adapter until the battery was fully charged, then using it until the battery runs down completely, then charge it up again. Once this was done, the firmware in the battery had a reference on how long it took to charge, and can roughly figure out how long you could use your Mac before needing a recharge.
Fortunately, according to Apple, if you have recent laptop (which Apple lists as any portable with a non-removable battery) this calibration is no longer necessary. In their support document:
Current Apple portable computer batteries are pre-calibrated and do not require the calibration procedure outlined in this article.
However if you have a removable battery, there are different procedures you should follow depending on which Mac laptop you have.
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