Mac turns off suddenly when not charging. No low bat

Discussion in 'MacBook Pro' started by lilith2014, Jun 22, 2011.

  1. lilith2014 macrumors newbie

    Joined:
    Jun 7, 2011
    #1
    Good day,

    My mac (unibody aluminium) is turning off suddenly when is not charging. Sometimes goes off when is 50% batt remaining sometimes around 78%. The battery is new, It has 31 cycles, 86% health.

    I already reseted the computer (taking battery out and pressing the power button 5 secs) but is not working. Some articles says it may be the OS (i have snow leopard).

    What should I do?
     
  2. awer25 macrumors 65816

    awer25

    Joined:
    Apr 30, 2011
    #2
    Open the bottom cover and make sure the battery connector is properly connected.
     
  3. deadwulfe macrumors 6502a

    deadwulfe

    Joined:
    Feb 18, 2010
  4. lilith2014 thread starter macrumors newbie

    Joined:
    Jun 7, 2011
    #4
    Thank you for your responses but I have tried those two suggestions before. The problem is that if I am working on my mac without the charger, the computer turns off without any warning and the battery percentage is not always the same (it never last more than 50%).
     
  5. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #5
    Try resetting the SMC.
     
  6. Koodauw macrumors 68040

    Koodauw

    Joined:
    Nov 17, 2003
    Location:
    Madison
    #6
    It has been my experience that it is most likely a bad battery. I had the same problem several years back with old aluminium Powerbooks, and Mac Book Pro. ( 2 different machines, same problem) Each time Apple would send me a new battery, and that took care of the problem on one of the machines, the other one they never could figure out.
     
  7. seinman macrumors regular

    Joined:
    Jun 15, 2011
    Location:
    Delaware
    #7
    Try calibrating it, as mentioned above. If that doesn't work, then this is most certainly a bad battery, seeing as it is reporting only 86% health after a mere 31 cycles. Mine is still in the high 80s after 500 cycles, and my last battery was hovering around 90% after 300. Get it replaced.
     

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