Macbook Pro 15in shutting off when run on battery

Discussion in 'MacBook Pro' started by Klokio, Apr 18, 2011.

  1. macrumors newbie

    Joined:
    Apr 18, 2011
    #1
    Hi everyone,

    I have the last model of the MBP that had the removable battery (so I think 2008), recently whenever I run it on the battery it shuts off at pretty high percentages charged, for instance it just shut off and was at 60% charge. This doesn't happen when it is plugged in with the battery in or out (I frequently take the battery out in an attempt to save it when I'm at my desk anyway).

    I'm going to guess this is just a battery problem and mine is going bad, even though istat says 85% health. Anyone else having this problem?

    Thanks for your time!
     
  2. macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #2
    .
     
  3. thread starter macrumors newbie

    Joined:
    Apr 18, 2011
    #3
    I would calibrate my battery, however it does not go to sleep when it runs down. It simply shuts off as if someone had pulled the battery out with no warning. Should I try and calibrate the battery this way?
     
  4. macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #4
    Reset the SMC, then try calibrating. Instructions for both in the link posted by Intell.
     
  5. macrumors 603

    Joined:
    Mar 14, 2008
    #5
    Don't take out your battery, for one it doesn't save it at all, so you're not doing it any good, and for seconds, you're making the computer cut back on its processing power.

    Put it in, and leave it in.

    http://support.apple.com/kb/HT2332
     

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