pb battery life problem

Discussion in 'General Mac Discussion' started by daxdagr8t, Aug 24, 2004.

  1. daxdagr8t macrumors member

    Joined:
    Jun 1, 2004
    #1
    I have a 12in pb revc, and for the past week I'm seeing a significant loss in battery life.I used to get four hours on average but now only three hours or even less doing light work.Even when fully charge the battery indicator indicates that I only have 3:30 hours on my batter. now my battery is running low after ihave fully charged it 3hours ago and used it sparingly.any suggestions? :( I already tried recalibrating my battery but i still experience the same problem.
     
  2. stoid macrumors 601

    stoid

    Joined:
    Feb 17, 2002
    Location:
    So long, and thanks for all the fish!
    #2
    Open up a Terminal and enter this command:

    ioreg -l | grep -i IOBatteryInfo

    That will give you some feedback on your battery's capacity. I don't know what you should be expecting though on the 12 inch, but I'm pretty sure that my 15 inch should be telling me 4600.
     
  3. daxdagr8t thread starter macrumors member

    Joined:
    Jun 1, 2004
    #3
    Thanks for the quick reply.I did that and I got 4502.Is this normal? :confused:
     
  4. Celeron macrumors 6502a

    Joined:
    Mar 11, 2004
    #4
    I have a rev. B 12'' Powerbook and I'm showing 4147 from that command, so I would say yours is in the normal range. When I got my PB is said 4200 but has since decreased since I got it in March. You can try calibrating the battery by running it completely empty, ignoring the warning messages, until the Powerbook forces itself to sleep. At this point, plug it in until it is charged completely.
     
  5. abhishekit macrumors 65816

    abhishekit

    Joined:
    Nov 6, 2003
    Location:
    akron , ohio
    #5
    I think it may be a little low. I always get around 4600 on my 12" pb. I did it now, and got 4668.
     

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  6. jane doe macrumors 6502

    Joined:
    Feb 18, 2004
    #6
    PMU reset

    Try resetting your PMU and then charge it and see what life you get.
     
  7. C-Mezak macrumors regular

    C-Mezak

    Joined:
    Jul 14, 2004
    Location:
    Edinburgh, Scotland
    #7

    Im sorry. Ive heard this before, but I dont know what it means! PMU? Coul somebody enlighten me?

    Thanks
    charlie
     
  8. abhishekit macrumors 65816

    abhishekit

    Joined:
    Nov 6, 2003
    Location:
    akron , ohio
    #8
    PMU=power management unit, its an ic on the logic board.
    to reset it, turn your pb off. press ctrl+option+shift+power simultaneously. wait for some time, and turn it on.
     
  9. C-Mezak macrumors regular

    C-Mezak

    Joined:
    Jul 14, 2004
    Location:
    Edinburgh, Scotland
    #9
    many many thanks.
     
  10. daxdagr8t thread starter macrumors member

    Joined:
    Jun 1, 2004
    #10
    I did that, and it seems to solve my battery life problem. :D
     
  11. IJ Reilly macrumors P6

    IJ Reilly

    Joined:
    Jul 16, 2002
    Location:
    Palookaville
    #11
    Apple also recommends recalibrating the battery indicator by allowing the battery to run down until the PB goes into forced sleep mode, then recharging. (Not all the time, but when it seems not to get above about 95% charged.)
     

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