13 MacBook Pro Battery Life

Discussion in 'MacBook Pro' started by baconmacNcheese, Oct 16, 2009.

  1. baconmacNcheese macrumors newbie

    Joined:
    Jul 7, 2009
    #1
    Is there a website where I can go to to reference where the battery capacity should be based on age/and load cycles?

    My current capacity is at 92% for 19 cycle loads and my MBP is 6 weeks old. I just want to gauge if its "normal" or what have you. Thanks in advance.
     
  2. DivineEvil macrumors regular

    Joined:
    Feb 7, 2009
    #2
    It's not normal. Calibrate it!

    Mine is 98%, 64 charge cycles, 4 months old.
     
  3. kryptonianjorel macrumors 6502

    Joined:
    Jul 3, 2009
    #3
    Its not really "at" 92%, but that is what your computer thinks. Chances are it just needs a good calibration and you'll be all set
     
  4. baconmacNcheese thread starter macrumors newbie

    Joined:
    Jul 7, 2009
    #4
    I had just calibrated it.

    I had it plugged in for more than two hours.
    Used my laptop on battery power until it died.
    Let it rest for about 9 hours.
    Plugged it in and 92% showed up.

    I'm using the coconutBattery app. Should I be concerned?
     
  5. fabian9 macrumors 65816

    fabian9

    Joined:
    Nov 28, 2007
    Location:
    Bristol, UK
    #5
    Strange - I'm on 100% health after 116 cycles...
     
  6. LAS.mac macrumors 6502

    Joined:
    May 6, 2009
    Location:
    Mexico
    #6
    Mine is as old as yours, 6 weeks. I've 16 load cycles. and battery is 100% of capacity.
    I'd calibrate it again...
     
  7. Richard1028 macrumors 68000

    Joined:
    Jan 8, 2009
    #7
    Mine went down to 85% after a calibration and I knew that wasn't right so I calibrated again - no change, it was still at 85%.

    So, over the next couple of weeks I would just run off battery power until the mac said I had about an hour left and then plugged the magsafe back in. Almost immediately istat nano said I was at 87%.

    I've been doing this procedure at random (never letting the battery go dry before plugging in) for about 2 weeks now.

    I'm up to 95% health now after 82 cycles. Oddly enough, this problem only started with Snow Leopard. (I was at 100% under 10.5.8).
     
  8. baconmacNcheese thread starter macrumors newbie

    Joined:
    Jul 7, 2009
    #8

    I'm taking you advice, and so far, the capacity went down... I'm running SL, is this a SL bug?
     
  9. baconmacNcheese thread starter macrumors newbie

    Joined:
    Jul 7, 2009
    #9
    I've been doing this for a week now and there has been no improvement. It stays between 92%-94%... What do I do now? Should I contact Apple?
     
  10. MBHockey macrumors 68040

    MBHockey

    Joined:
    Oct 4, 2003
    Location:
    New York
  11. miles01110 macrumors Core

    miles01110

    Joined:
    Jul 24, 2006
    Location:
    The Ivory Tower (I'm not coming down)
    #11
    Apple's not really going to tell you anything useful. The only way you'll have a case for a replacement or even cause for worry is if it starts dipping below 80% with under 300 cycles. Definitely shouldn't happen on the unibodies.
     
  12. mrsir2009 macrumors 604

    mrsir2009

    Joined:
    Sep 17, 2009
    Location:
    Melbourne, Australia

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