Battery Health significant drop within minutes?

Discussion in 'MacBook Pro' started by M. Malone, May 16, 2009.

  1. M. Malone macrumors 6502a

    M. Malone

    Mar 11, 2004

    Yesterday I had my MBP Classic with 89% battery health full charged.

    I decided to play Warcraft 3 for a bit, after 3 minutes I get the battery warning message, I was surprised that a battery that lasts 5 hours just the day before died this fast.

    So I check out iStat pro and it says my battery health is at 19%

    now my mac can't stay charged for longer than 40 minutes or so.

    how could this be explained?
  2. jmaquarry macrumors member

    Jan 14, 2009
    your mac may be out of sync with your battery?
    have you tried letting the battery COMPLETELY drain then charging to 100% before switching on...
    this may restore your battery health -
  3. misterredman macrumors 6502a


    Oct 3, 2007
    Right. Try calibrating your batterylike described here:

    Be sure to follow the pricedure exactly.

    If you still have the problem I guess you will need to take it to a store.
  4. maflynn Moderator


    Staff Member

    May 3, 2009
    As the others say you need to calibrate the battery, I believe apple recommends that you do that every 6 months. I only do it when I see symptoms that you're currently experiencing.
  5. M. Malone thread starter macrumors 6502a

    M. Malone

    Mar 11, 2004
    Sorry for the late update.

    Thank you to everyone who posted, I did exactly what you all said and it worked perfect.

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