ibook battery...help

Discussion in 'PowerPC Macs' started by brsboarder, Feb 7, 2006.

  1. brsboarder macrumors 6502a

    Joined:
    Feb 16, 2004
    #1
    I have an ibook g4 800mhz, my battery has been pretty great so far, usually I only run down about 50% of the way, because I only use it off a charger for 2-3 hours at a time. Yet, suddenly, I noticed that it will get to around 47% left, after about 2-3 hours as expected and then suddenly go straight to 2-1%. I have no clue whats wrong, I am hoping you guys can tell me how to fix this
     
  2. mad jew Moderator emeritus

    mad jew

    Joined:
    Apr 3, 2004
    Location:
    Adelaide, Australia
    #2
    Run it off the battery until it sleeps and then charge it up to 100% in one go. This is called calibrating the battery. :)

    If that does nothing, then try resetting the PMU.
     
  3. dmetzcher macrumors regular

    Joined:
    Nov 26, 2005
    Location:
    NJ
    #4
    Also, keep in mind that this should only be done about once per month (every 30 cycles).
     
  4. Compatiblepoker macrumors regular

    Joined:
    Feb 8, 2006
    Location:
    Jacksonville Beach
    #5
    Did this work for you? My battery is doing the same thing.

    Thanks
    Roger
     
  5. mad jew Moderator emeritus

    mad jew

    Joined:
    Apr 3, 2004
    Location:
    Adelaide, Australia
    #6
    Compatiblepoker, how old is your battery. Whilst a PMU reset and a calibration may help, if it's an old battery then there aren't really any steps you can take. I recommend trying a PMU reset and then a calibration (in that order for maximum effect). It won't do any harm but it certainly isn't guarantied to fix anything. :)
     

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