Battery Capacity Question

Discussion in 'MacBook Air' started by teerexx52, Nov 9, 2010.

  1. teerexx52 macrumors 68000

    teerexx52

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    #1
    I have a week old 11.6" MacBook Air. The battery has 3 cycles. However, using Coconut battery the battery capacity is showing 96% fully charged. Would that be unusual after 3 cycles? Thanks
     
  2. spinnerlys Guest

    spinnerlys

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  3. neteng101 macrumors 65816

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    #3
    All Mac batteries drain down to 95% before the charging process occurs again. The question is really what is the battery capacity reported, between current and designed. Mine's at 101% for now.
     
  4. teerexx52 thread starter macrumors 68000

    teerexx52

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    #4
    No, I haven't calibrated it yet. Would that be the cause of the reading?
     
  5. spinnerlys Guest

    spinnerlys

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    #5
    I think you somehow confuse two things:

    One is the charge (95%, mentioned by you), the other is the battery health (97%, mentioned by the OP).

    For example: The 2009 17" MBP has a battery capacity of 13,000mAh, if the charge is at 95%, there are still 12,350mAh of charge left.
    If the battery health is reported as 97%, the maximum battery capacity is reduced to 12,610mAh, thus 95% charge of that capacity would be 11,980mAh.

    It is true, the battery not always charges to 100% charge, but it normally does over time.

    [​IMG]




    Seems that way.

    from Apple Portable: Calibrating your computer's battery for best performance
     
  6. teerexx52 thread starter macrumors 68000

    teerexx52

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    #6
    .
    Thanks. Mine shows design capacity 4680, current capacity 4501 It says its 100% charged but only 96% of capacity. Unless its because it has not been calibrated isn't that much loss over 3 load cycles unusual. I mean 4% for 3 load cycles. If that were to continue at that rate? I'll calibrate it tomorrow
     
  7. spinnerlys Guest

    spinnerlys

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    #7
    The battery has to be "run in". My MBP's battery fell from 99% to 91% in less than 30 cycles, but over time and due to proper calibration, the battery health is now reported as 99%.

    Maybe you have noticed this, but this topic comes up every day, almost anyway, thus you should find plenty of threads about this.
     

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