What's your full charge capacity on your 15" MBP?

Discussion in 'MacBook Pro' started by zentenk, Apr 24, 2010.

  1. zentenk macrumors member

    Joined:
    Apr 17, 2010
    #1
    I noticed that the full charge capacity for my mac varies. On first charge it indicated 6580mAh, then on second charge 6685mAh(which the software indicated that I was able to fully charge to this capacity), then now after I unplugged it for a bit it now says the full charge capacity is 6850mAh. I'm planning to calibrate my battery on this discharge.

    Anyone experience this?
     
  2. diablo2112 macrumors 6502

    Joined:
    Apr 16, 2010
    #2
    My indicated battery capacity (15" i7) has been slowly increasing this week. Started at 69xx and it now about 7150 mAh. Nameplate capacity on the battery is listed as 7700 mAh, be interesting to see how far in this actually goes.

    The battery chemistry is A123 Li-polymer. These are very picky batteries, and the cells can be ruined if they discharge below about 3.1V/cell, or if the cells get unbalanced. I would guess the battery controller is conservative, and this explains the difference between the nameplate and measured capacities. Simply the controller being careful to keep each cell above the threshold voltage.
     
  3. zentenk thread starter macrumors member

    Joined:
    Apr 17, 2010
    #3
    on the note of battery calibration should i let it increase more before I do the calibration for more accurate battery estimates?
     
  4. NOTORIOUS187 macrumors member

    Joined:
    Dec 31, 2009
    #4
    What's the best way to go about calibrating the battery in our new MBPs? Coconut battery program? What's the process to discharge/charge/calibrate that is suggested?
     

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