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Saturday, August 17, 2013

Macbook Air (2008) shuts down on its own at ~20%

Hi! I recently purchased a used Macbook Air and am running OSX Mountain Lion on it. I absolutely love it, but there's one problem: when the battery gets close to or down to 20%, it shuts down without warning, much as if I'd shut it down myself, except sudden. I've tried resetting my SMC--in fact, my bluetooth messed up and I did it to fix that--but it hasn't helped. I've only ever seen a battery warning once, when it got to 9%. Does anyone know how to reset the battery warning (to, say, 25%) or fix/recalibrate the battery to act properly and not shut down at 20%? Thank you, everyone, for your help in advance.

 

-Nova


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