5 Replies Latest reply: Nov 25, 2012 2:44 PM by serenity99
serenity99 Level 1 Level 1

I have a Macbook Pro and I keep it plugged in so the battery is - or should be - always at full power. However, yesterday and today I noticed it is at 96% instead of 99 or 100. Should I unplug it and let it run down?


MacBook Pro, Mac OS X (10.6.8)
Solved by etresoft on Nov 25, 2012 11:38 AM Solved

serenity99 wrote:

 

I unplug it and let it run down?

No. Don't worry about it.

Reply by steve359 on Nov 25, 2012 12:13 PM Helpful

You should never let it run dead.  That kills LithiumIon batteries.

 

You can run it on AC power mostly, but should let it run down to 40% (some say no less then 50%) at least once a month and then recharge, just to exercise the battery.

 

Remember MBP batteries have a cycle count of 1000.  1 charge from 1% to 100% is one cycle, 2 charges from 50% to 100% is 1 cycle, etc.

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