Fully draining/recalibrating a MBP battery

Discussion in 'MacBook Pro' started by r-sparks, Apr 10, 2010.

  1. r-sparks macrumors 6502

    r-sparks

    Joined:
    Dec 1, 2006
    Location:
    England
    #1
    Got a brand-new 13-in 2.53GHz Macbook Pro a few weeks ago.

    Last week it started showing that the battery needed servicing. Then it seemed to fix itself but would randomly go into power saving mode when I was using it.

    I took it to an Apple store and they replaced the battery and reset the SMC.

    The problem is that the new battery just doesn't seem to last as long as the old one.

    I followed the instructions to calibrate the battery (the Apple KB article), but when I plugged the power back in, it still had 5% juice left in the battery.

    The new battery seems to have healthy figures compared to the old one. I've reproduced the figures from System Info below.

    Any help or advice to completely flush the battery?


     
  2. itommyboy macrumors 6502a

    itommyboy

    Joined:
    Feb 26, 2009
    Location:
    Titletown USA
    #2


    ...then you didn't follow the instructions properly - I suggest you do it again. The most imperative step of battery calibration is completely draining the battery - then letting your Mac sit on that completely drained battery (not plugged in) over night. If you do this step as mentioned by the motersh:apple:p it will solve your "issue". That being said all your #'s look good I doubt you have an issue really. Battery's are like partners mileage will vary. ;)
     
  3. r-sparks thread starter macrumors 6502

    r-sparks

    Joined:
    Dec 1, 2006
    Location:
    England
    #3
    Tried it all several times, not working :-(
     
  4. r-sparks thread starter macrumors 6502

    r-sparks

    Joined:
    Dec 1, 2006
    Location:
    England
    #4
    I seem to have fixed it by following the instructions found on this article:

    http://reviews.cnet.com/8301-13727_7-10426564-263.html

    I did three things:

    1. The calibration run-down (i.e. running the battery to zero and leaving it unused overnight)

    2. Resetting the PRAM

    3. Booting into safe mode, and then restarting

    It's quite strange but the battery was draining quickly before I did this at around 50% of remaining juice, and since then it's been draining very slowly indeed. I've no idea what the issue was.

    Oh, and I also switched down the backlight about a notch or two. I think the PRAM reset might have reset the backlight optimisation, because I don't think it was happening previously.
     
  5. itommyboy macrumors 6502a

    itommyboy

    Joined:
    Feb 26, 2009
    Location:
    Titletown USA

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