Battery Calibration: Ok to turn off after first charge is completed?

Discussion in 'MacBook Pro' started by Blue Sun, May 18, 2010.

  1. Blue Sun macrumors 6502a

    Feb 11, 2009
    Hi guys

    I've got the 15" MBP with a Core i5 and I've nearly finished calibrating the battery.

    After the MBP became fully charged, I left it for 2 hours, used it a bit, then shut it down. I've been using the MBP as much as possible (to discharge the battery) for a few days now. But I have been shutting the machine down when not in use.

    Currently the machine is resting with 0% charge for a minimum of 5 hours (like Apple suggests). I'm wondering if by shutting it down those few times, will it affect the battery calibration?
  2. miles01110 macrumors Core


    Jul 24, 2006
    The Ivory Tower (I'm not coming down)
    Not significantly. The amount of worry surrounding battery calibrations is sadly disproportionate to the effect of taking one small misstep during the process.
  3. GGJstudios macrumors Westmere


    May 16, 2008
    That's not the way to calibrate. After it's been fully charged for 2 hours, unplug it and let it run completely down. Do not shut it off. Let the battery drain until it shuts itself off. Then let it sit for 5 or more hours before plugging it back in. This is easy to do overnight.

    Calibrating a portable computer battery

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