13" 2009 MBP battery calib lowered the capacity

Discussion in 'MacBook Pro' started by seong, Aug 17, 2010.

  1. seong macrumors 65816

    seong

    Joined:
    Feb 11, 2010
    #1
    Hey all, I saw some threads where it is recommended to calib the battery if the person is using the laptop from the AC power for the most of the time.
    Which I did yesterday.

    Plugged in for 2 hours. (with full charge)
    Let the computer do some heavy works.
    the computer automatically shut down.
    I had to go for work, so I left the computer the way it was for 9 hours.
    Came back, and plugged in the charge before I went to sleep.

    Right now, I have coconut battery open, and it tells me:
    Current Battery Capacity: 5051mAh (92%)
    Original Battery Capacity: 5450mAh

    It used to hit 5505mAh (100%) before calib. Did I do something wrong or is this normal?
     
  2. alust2013 macrumors 601

    alust2013

    Joined:
    Feb 6, 2010
    Location:
    On the fence
    #2
    It fluctuates. I have seen mine as low as 92% or as high as 98%, so I wouldn't worry about it. It is also likely that it reports lower because you drained the battery quickly. Ideally, if you drain it by surfing the net, word processing, etc, it will be a bit more accurate when calibrating.
     
  3. Gabriel GR macrumors 6502a

    Gabriel GR

    Joined:
    Jul 12, 2009
    Location:
    Athens, Greece
    #3
    let it drain and charge again. It should be fine.
     
  4. KirkL macrumors 6502

    Joined:
    Jul 27, 2010
    Location:
    United States
  5. DanMacApple macrumors 6502

    Joined:
    Jul 1, 2010
    #5
    You don't necessary have to calibrate it again, but give it a few cycles and it should start to correct. Also make sure you have the newest version of coconut battery.
     
  6. alust2013 macrumors 601

    alust2013

    Joined:
    Feb 6, 2010
    Location:
    On the fence
    #6
    No need to worry about that. They don't keep 100% capacity for very long, if at all, but they will stay in the mid-upper 90s for a very long time. I'm at 144 cycles and have 96% health still.
     
  7. seong thread starter macrumors 65816

    seong

    Joined:
    Feb 11, 2010
    #7
    thx a lot guys!!!!!!!!!
    now I don't have to be paranoid.
     
  8. KirkL macrumors 6502

    Joined:
    Jul 27, 2010
    Location:
    United States
    #8
    Oh okay. I've run scared and am using it at AC power mostly. I'll run it off battery and see how it works out.
     

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