Why does my Mac's battery not charge when it is above 95% full?

Question

Why does my Mac's battery not charge when it is above 95% full?

Whenever my Mac's battery is above 95% full, it won't charge.

Is this some sort of safety feature?

MacBook Pro, OS X Mountain Lion (10.8.2)

Posted on Feb 20, 2013 2:43 AM

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Answer 1

OGELTHORPE

Level 9

57,305 points

Feb 20, 2013 3:02 AM in response to Iamawesome997

Not a safety issue. It is just the way it is supposed to work.

When the battery reaches 100% charge, the power adapter charges the MBP but not the battery. Then the battery slowly losses its charge and at the 95% level the power adapter will start recharging the batttery till it reaches 100% again. So the cycle continues.

Rest easy.

Ciao.

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Answer 2

Shootist007

Level 6

16,703 points

Feb 20, 2013 3:08 AM in response to Iamawesome997

It is so the battery doesn't do what is called Short Cycle charging. That is were the battery drops 1 or 2 % then charges back to 100%. That is bad for the battery. It is alos best to let the battery run down to below 50% every now and then and then do a Full Recharge to 100%.

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Answer 3

pennbank

Level 4

1,688 points

Feb 20, 2013 5:08 AM in response to Iamawesome997

See Article

http://support.apple.com/kb/TS1909

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