Battery capacity fluctuation

Discussion in 'MacBook Pro' started by shirazik, Apr 27, 2008.

  1. shirazik macrumors newbie

    Feb 27, 2008
    So when I check my "current capacity" for my battery it fluctuates between 99% and 93%. I have 16 charge cycles. For example, today I was using my laptop unplugged and it was at 93% capacity, but now I'm charging it (it's not even done charging) and the capacity went to 99%.

    There seems to be no rhyme or reason why this happens. It's not really bugging me, but I'm just curious as to why it does that.


    BTW, I have a 2.4 SR MBP.
  2. scienide09 macrumors 65816


    May 5, 2007
    Multiple threads on this subject...

    The batteries are designed to slowly trickle discharge while the until is plugged in, to keep the electrons flowing. It normally drops to ~95%, and then recharges to full. So if you're seeing the range from 93-100%, that's pretty normal.

    Also, if you haven't calibrated your battery in a while, this may be why you're seeing the variation.
  3. tMac85 macrumors 65816


    Sep 15, 2007
    in a great place
    mine does the same thing and i have the same mbp you do. so no worries. the other day mine dropped from 100 to 93. an hour later it was back up to 100.
    but yes calibrate it, atleast once a month.

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