I'd like to charge my rMBP battery only up to 85% or 90%, in order to preserve it.

Is there any app that stops charging at user selected percentages?

If not, is there any other method? (Apart from manually detaching power cable, obviously).

  • Buy a plug power timer, work out how long 1 percent takes to charge and then set it to the appropriate time for the current percentage and the needed percentage. The Timers do exist but I have only every found one on sale in a pound (£) shop once. the timer is like a count down timer (egg time style) not a 24h timer. I use mine for my iron otherwise I will forget to turn it of. – markhunte Mar 17 '15 at 17:24
  • This one is not from the uk but as an example hpm.com.au/Products.aspx?pid=422 – markhunte Mar 17 '15 at 17:40
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    What do you mean "preserve it"? – tubedogg Mar 17 '15 at 19:12
  • I mean, to maintain it around 40%, in order to maximize its lifespan.. – MadHatter Mar 18 '15 at 10:47
  • Mh, perhaps i found the solution... Excluding the middle pin of magsafe2 (signal) will cause the macbook to user wall power but NOT charge the battery. – MadHatter Mar 18 '15 at 10:49

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