13 MacBook Pro Battery Life

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

  1. baconmacNcheese macrumors newbie

    Jul 7, 2009
    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

    Feb 7, 2009
    It's not normal. Calibrate it!

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

    Jul 3, 2009
    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

    Jul 7, 2009
    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


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

    May 6, 2009
    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

    Jan 8, 2009
    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

    Jul 7, 2009

    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

    Jul 7, 2009
    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


    Oct 4, 2003
    New York
  11. miles01110 macrumors Core


    Jul 24, 2006
    The Ivory Tower (I'm not coming down)
    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


    Sep 17, 2009
    Melbourne, Australia

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