MBP battery not showing 7 hours anymore

Discussion in 'MacBook Pro' started by petrucci666, Nov 30, 2009.

  1. petrucci666 macrumors 6502a

    Joined:
    Apr 30, 2009
    Location:
    San Francisco, CA
    #1
    I've had my 13" MBP for 2 months now and the 7 hour battery has been nothing but a benefit so far. However, I've noticed that the battery isn't showing the 7 or even the 6 hours mark anymore at 100% charge. My battery health is still at 100% and restarting the MBP hasn't helped fix this problem either.

    Any ideas why this is so?
     

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  2. jav6454 macrumors P6

    jav6454

    Joined:
    Nov 14, 2007
    Location:
    1 Geostationary Tower Plaza
    #2
    THe 7 hours is a representation at best case scenario. Real world gets you 4-5 hours.

    I get 3:30 hrs on my 5hr rated battery, not bad.

    Pic included
     

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  3. dudeitsjay macrumors regular

    Joined:
    Mar 26, 2009
    #3
    Well if you keep the settings consistent, the amps out per hr calculation is pretty accurate. So if you stabilized the computer and retained the same settings and maybe 5-10 minutes afterwards kept the timer, it should be what it predicts. I would get 7:30 on my battery icon calculation, and I would get that amount days on end.
     
  4. skye12 macrumors 65816

    skye12

    Joined:
    Nov 11, 2006
    Location:
    Austin, Tx
    #4
    68 cycles is a lot for 3 months. The battery losing a little capacity is normal.
     
  5. angusslo macrumors regular

    angusslo

    Joined:
    Aug 4, 2009
  6. dashcs macrumors regular

    Joined:
    Oct 2, 2009
    #6
    http://www.apple.com/batteries/notebooks.html

    Site has useful information

    If you have most things turn off then something is running in the background.

    You can check whats taking all the cpu with activity monitor inside your utilities folder
     
  7. jav6454 macrumors P6

    jav6454

    Joined:
    Nov 14, 2007
    Location:
    1 Geostationary Tower Plaza
    #7
    You are charging your battery wrong and hence killing it.

    Do this for a week and watch your battery recover:

    1. Use laptop until it hits 7-5% battery power left.
    2. Recharge to a 100% state and leave it there for the remaining day
    3. Use next day until you reach 5-7%
    4. Repeat step 2-3.
     

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