Heat is a killer, and when plugged in AND charging, you get extra heat that causes damage.Draining a battery all the way to zero all the time is bad for the cell (Which is why ~10% is used).Apple specifically recommends not to leave it plugged in all the time on their website.Because of known LiPo chemistry issues, holding a 100% charge for a long time causes the battery to degrade.There are lots of good reasons why Option 2 is the way it is: In this case the negative effect of holding LiPo batteries at 100% would outweigh everything else. Those micro-charge cycles would add up at the same rate as 100% -> 0% -> 100%, and you would get no gain. Your battery would drain to 99%, then back up to 100%, then back down to 99%, etc. If this is NOT true, and the AC adapter only goes to charging the battery, then there would be no difference. However, this is a purely speculative assumption and I could find no evidence to either confirm or deny. If that's the case, it would seem that the LiPo drop from holding at 100% would be vastly outweighed by the fact you're not using any charge cycles. Now IF Apple engineers were smart and optimized for AC draw when plugged in to not use up your charge cycles, then it seem logical to assume that you are using effectively none of your 1000 charge cycles while plugged in. Even still I feel they don't conclusively answer the question above. Here are some of the better sources I've found about battery behavior so far. Which method is better and why? How much of a difference does it really make? Charge to ~100%, drain to ~10%, repeat.
Best practices for new mac battery full#
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