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Battery health drop after 100 cycles

Discussion in 'MacBook Air' started by ayeying, Aug 4, 2009.

  1. macrumors 601


    I noticed this in my previous Rev. A. After 100 cycles, my health dropped from 98% -> 92-94%. Now on my Rev. C, I'm at 136 cycles and my health dropped from 99% -> 92%.

    I calibrated my battery already, but is the MBA's battery just purposely dropping health after a certain cycle count or what?
  2. macrumors 604


    I wouldnt worry too much. Battery calibration/monitoring software isn't exactly accurate.
  3. macrumors 601


    Battery monitoring software reads the battery info from the System Profile located in the Utilities. They don't make things up here.

    The weird part is that it just suddenly drops after 100+
  4. macrumors 604


    What I mean is battery health percentages are never accurate regardless of where they come from. My battery health says my battery is at 40% health yet I get 4 hours of battery on the notebook in my sig.

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