Battery Calibration

Discussion in 'MacBook Pro' started by MarkW19, Mar 19, 2008.

  1. MarkW19 macrumors 65816

    Joined:
    Sep 13, 2002
    Location:
    Surrey, UK
    #1
    I calibrated my battery the other day (charged it up, left it fully charged and plugged in for 4 hours, unplugged and drained it, then left it sleeping for 7 hours, charged back up again), but ever since it's been showing full battery as 97%. Before I calibrated, it was 99% or 100% for "fully charged".

    Can anyone help?
     
  2. wrldwzrd89 macrumors G5

    wrldwzrd89

    Joined:
    Jun 6, 2003
    Location:
    Solon, OH
    #2
    Hmm... that's odd. Perhaps it's the way you calibrated? I always calibrate by charging the battery until full, running it down until it automatically goes to sleep, then plugging it in and charging it until full again - that's what I remember the instructions that came with my computer said to do to calibrate the battery.
     
  3. MarkW19 thread starter macrumors 65816

    Joined:
    Sep 13, 2002
    Location:
    Surrey, UK
    #3
    I followed the instructions on the Apple site, which are the steps above. I'll try doing it again.
     
  4. sjb macrumors regular

    Joined:
    Jul 3, 2007
    #4
    Once the laptop goes to sleep, you're supposed to let it sleep for at least 5 hours. Here are the instructions:

    http://docs.info.apple.com/article.html?artnum=86284
     
  5. gloves macrumors newbie

    Joined:
    Feb 8, 2008
    #5
    A silly question I have regarding the calibration process for the Macbook Pro: After letting the laptop sleep for 5 hours, when you plug the charger back into the laptop, are you supposed to continue letting the laptop sleep until it is fully charged?

    Or can you actually get the same effect while charging the laptop and using it at the same time? :confused:
     
  6. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #6
    The calibration is just charge full, discharge fully and recharge fully. Nothing special. Sometimes that health meter is wacky as well so don't always depend on it.
     
  7. gloves macrumors newbie

    Joined:
    Feb 8, 2008
    #7
    Thanks alphaod. So it doesn't matter whether the laptop's being used while charging or not. That's great news - makes it easier to do the calibration on a regular basis rather than having to plan to do without the MBP. :)
     
  8. MediaRyan macrumors member

    Joined:
    Dec 26, 2007
    #8
    I had no idea this existed.

    Is this something you do after a few months of use to be sure the indicator is accurate?
     
  9. e12a macrumors 68000

    e12a

    Joined:
    Oct 28, 2006
    #9
    there is a difference however. While powerbooks dont require a 5 hour wait, some model Powerbooks, Macbooks and Macbook Pros require a 5 hour "dead" time before recharging. After waiting at least 5 hours, you can begin recharging your mbp/mb, and during this time you may use the computer. So its best to drain the battery at night before you go to bed.
     

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