88 percent battery capacity - acceptable?

Discussion in 'MacBook Air' started by dabear, Apr 16, 2012.

  1. dabear macrumors newbie

    Mar 4, 2011
    I kinda feel my macbooks battery lasts a bit shorter now, than it used to when the machine was new. Current capacity is as low as 88% of the design capacity
    What would you think is an acceptable battery percentage? How low can it get before I can get the battery replaced?

  2. GGJstudios macrumors Westmere


    May 16, 2008
    Your battery is designed to retain up to 80% of its capacity up to 1000 cycles. If it drops below 80% before then, take it to Apple to check to see if it's defective. It is perfectly normal if your battery health (maximum capacity) is more or less than 100%, even when brand new, or if it fluctuates up or down over time. For further details, read the CHECKING STATUS AND HEALTH section of the following link.

    This should answer most, if not all, of your battery questions:
  3. heisenberg123 macrumors 603


    Oct 31, 2010
    Hamilton, Ontario
    the health or capacity will fluxuate up and down, could be 91% in a few days


    ninjaed again by the speed GGJ
  4. Dangerous Theory macrumors 68000

    Jul 28, 2011
    While they say it should be about 80% after 1k cycles, they don't promise anything. I wouldn't take it to Apple because it says 78% instead of 80 :p if it reaches 80% at like <800 cycles there'd definitely be cause for concern IMO.
  5. calvol macrumors 6502a

    Feb 3, 2011
    It's probably normal if the Air is running off battery most of the time. For comparison, I've had my machine 15 months, use it daily, but run it off AC most of the time capacity is still over 6K MaH.

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