After calibrate battery, my battery health drop 3%...

Discussion in 'MacBook Air' started by matrix07, Aug 18, 2014.

  1. matrix07 macrumors 601


    Jun 24, 2010
    from 96% to 93%, while it took 5 months to drop from 100% to 96%.

    Is this normal? Doesn't look like it for me.
    Is calibrate battery necessary?

  2. Newtons Apple, Aug 19, 2014
    Last edited: Aug 20, 2014

    Newtons Apple macrumors Core

    Newtons Apple

    Mar 12, 2014
    Jacksonville, Florida
    Sometimes the true battery health is not known until you do a calibrate.

    These batteries do not last forever.
  3. matrix07 thread starter macrumors 601


    Jun 24, 2010
    Oh.. I see.
  4. Atomic Walrus macrumors 6502a

    Sep 24, 2012
    Also, don't calibrate your battery. Apple has updated all of their battery info and no longer recommends intentionally adding cycles to the battery for any reason (calibration, "exercise," etc).

    "With lithium-ion batteries, the capacity diminishes slightly with each complete charge cycle."

    In your case you didn't actually cause the battery to lose 3% of capacity (that's just the effect of calibration), but in general it's not worth doing a deep discharge just to increase battery capacity accuracy slightly.
  5. GGJstudios macrumors Westmere


    May 16, 2008
    The built-in batteries in the newer Mac unibody notebooks come pre-calibrated and do not require regular calibration like the removable batteries in older Apple notebooks.

    Your battery is fine. It is perfectly normal if your battery health (maximum capacity) is more or less than 100%, even when brand new, or if it fluctuates up or down over time. The gradual decline is not in a straight line downward, and it may decline more rapidly at some times and slower at others. For further details, read the CHECKING STATUS AND HEALTH section of the following link.
    The link below should answer most, if not all, of your battery/charging questions. If you haven't already done so, I highly recommend you take the time to read it.
  6. matrix07 thread starter macrumors 601


    Jun 24, 2010
    Oh.. well...



    I'll read your link. Thank you.

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