Battery Health

Discussion in 'MacBook Pro' started by In Sams World, Dec 16, 2007.

  1. In Sams World macrumors newbie

    Sep 24, 2007
    So, ive had my Macbook 2 months now and until last night battery health was 100%, wake up this morning and it has dropped all the way to 91% !!! in one night!

    Has anyone heard of this before?

    Also ive heard of calibrating the battery how does one do this and what exactly does it do?

    Much appreciated.
  2. scienide09 macrumors 65816


    May 5, 2007
    Through the power of the Interweb, one can do all sorts of crazy things, including searching these forums or the Apple website for more information.
  3. khunsanook macrumors 6502


    Jul 2, 2006
    East Asia
    If you google "calibrate macbook battery" the first hit is exactly what you need

    You should drain your battery at least once or twice a month to keep it healthy. My battery is at 83 cycles, 86 percent health. Battery monitoring programs are variable. This is my second battery. The first one showed ridiculously high health after 100 cycles, but would die with 10 percent charge left. Apple replaced it. More on recent battery issues...

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