Finnicky Battery?

Discussion in 'MacBook' started by Young Spade, Apr 20, 2011.

  1. Young Spade macrumors 68020

    Joined:
    Mar 31, 2011
    Location:
    Tallahassee, Florida
    #1
    For the past 3 days or so, the health of my battery went from the mid-high 80s down to around 50%, causing me to drastically limit the amount of time I could use while off the charger;I could get around 2 hours max if I did light things like surf the web or compose documents.

    I recently bought a replacement battery so it should get here soon, however just today I pulled it off the charger and the health went back up to 85 percent and I'm getting around 3.5 hours off the charger.

    I'm glad the new battery is coming, however do you have any idea why it would jump around like this? I turned it off multiple times during this whole charade along with sleeping (which I do regularly) so I have no idea why this is happening.

    41 month old with 546 cycles.

    08 BlackBook. Thanks :)
     
  2. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #2
    Reset the SMC and calibrate your battery to make sure your readings are accurate. Also, be aware your battery is designed to retain up to 80% of its original capacity up to 300 cycles. you're well beyond that. This should answer most, if not all, of your battery questions:
     
  3. AWallen90 macrumors 6502

    Joined:
    Sep 15, 2009
    #3
    With a battery that old you need to condition at least once a month. I have found that coconut battery give a quick insight to where battery health.
     
  4. discounteggroll macrumors 6502

    discounteggroll

    Joined:
    Aug 6, 2006
    Location:
    Greenwich, CT
    #4
    546 cycles is up there, I would not be surprised with strange experiences with such a high cycle count. Definitely condition your battery if possible though Complete charge to 100% if possible, complete usage to as low as possible. Repeat this cycle again, never connecting the power in between.
     
  5. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #5
    That's not how you "condition" a Mac battery. Read the CALIBRATION section of the FAQ I posted.
     
  6. Young Spade thread starter macrumors 68020

    Joined:
    Mar 31, 2011
    Location:
    Tallahassee, Florida
    #6
    Uh.. yea that's not how you calibrate the battery... and I calibrate it monthly already... but thanks for that though.
     

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