PB battery drains even when plugged in

Discussion in 'Mac Basics and Help' started by moliere, Jul 31, 2005.

  1. moliere macrumors newbie

    Joined:
    Jul 14, 2005
    #1
    I've been monitoring the charge on my powerbook, and I noticed that it loses 0.1% of its charge every 8 hours or so. I recalibrated by draining the battery and charging it back up again, and it does charge to 100%, but after a day, the charge is down to about 99.7%. Right now, it's 99.2% although it's been plugged in for the last two days.

    I've been monitoring this for the last two weeks, and I find it extremely odd. I reset the PMU, and there is no change in the behavior. Does anyone have any ideas as to what is going on?

    Thanks.
     
  2. rainman::|:| macrumors 603

    rainman::|:|

    Joined:
    Feb 2, 2002
    Location:
    iowa
    #2
    I believe deviation between 98-99.9% is acceptable, it still indicates a "full charge". but i can't explain the behavior. how long have you had the PB, and approx. how many times has it been discharged/recharged?
     
  3. moliere thread starter macrumors newbie

    Joined:
    Jul 14, 2005
    #3
    My powerbook is 6 weeks old. The battery cycle count is 15 (I used it off the charger quite a bit in the first 3 weeks). The funny thing about it is that it does charge to 100% after I connect the charger, then slowly, the percentage decreases over time very consistently.

    It's more a matter of curiousity for me right now. The last time I used it off the charger (Wednesday last week), I still got over 3 hours with it, with Airport and BlueTooth on, so the battery seems to be fine. I just don't want anything wonky going on with my brand new powerbook. For the money I spent on it, it better be close to perfect. :cool:
     
  4. Benjamin macrumors 6502a

    Benjamin

    Joined:
    Oct 27, 2003
    Location:
    Portland, OR
    #4
    yeah it discharges so it doesn't explode in your face since over charging is bad. Most likely it will toggle from anywhere between 95% - 100%.
     
  5. moliere thread starter macrumors newbie

    Joined:
    Jul 14, 2005
    #5
    Okay, that does make sense. I still have a ways to go with respect to Apple Care, so I guess I don't have to worry about this too much just yet. Thanks for the insight, though.
     

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