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Re:The Nightmare of Replacing a Battery on a Mac Laptop by ant6n on Wednesday October 28, 2015 @12:26PM (#10465381)
"If your portable Mac has a built-in battery, you don’t need to calibrate the battery."

Also, this 'calibration' is just charging and discharging. Which happens normally. Also, the mac doesn't go to sleep, it crashes, so I guess it doesn't get calibrated.

Maybe I'm holding it wrong. ;)

Re:The Nightmare of Replacing a Battery on a Mac Laptop by n1000 on Wednesday October 28, 2015 @12:44PM (#10465565)
It is about the battery controller learning how much charge the battery can still hold. Therefore it needs a completely empty battery and an uninterrupted full charge.

Also on the built-in batteries I found that it helps to get a more accurate battery estimate and improve the "battery health" rating.