PowerBook G4 12" PRAM battery?

Discussion in 'PowerPC Macs' started by kylera, Feb 18, 2011.

  1. kylera macrumors 65816

    kylera

    Joined:
    Dec 5, 2010
    Location:
    Seoul
    #1
    I've searched for this online because my PowerBook isn't keeping time if I don't maintain a battery charge, but some people say that there is no clock battery in the 12-inch model...which I find to be ludicrous. Any suggestions?
     
  2. MacHamster68, Feb 19, 2011
    Last edited: Feb 19, 2011

    MacHamster68 macrumors 68040

    MacHamster68

    Joined:
    Sep 17, 2009
    #2
    yes there is no separate pram battery in the 12" PowerBooks(like on iBooks too ). instead there is a small capacitor that maintains the system clock/Pram long enough(according various sites between 15 and 30 seconds) to swap the main battery for a fresh charged one or to plug in mains , so always keep a charged battery around
    here that little thing
    http://www.thebookyard.com/product.php?products_id=1884
     
  3. kylera thread starter macrumors 65816

    kylera

    Joined:
    Dec 5, 2010
    Location:
    Seoul
    #3
    So what this means is that even if this were a brand-new model, and the battery hits rock bottom, the time would still change??
     
  4. MacHamster68, Feb 19, 2011
    Last edited: Feb 19, 2011

    MacHamster68 macrumors 68040

    MacHamster68

    Joined:
    Sep 17, 2009
    #4
    yes if the battery is empty and if you are not quick enough to plug it into mains or have a spare battery around , but usually you need just to go online to let it update the time itself , so nothing to worry
    the only worry might be if you have a near full battery and/or plugged into mains and the clock is changing regardless of charge , then its time to change this capacitor , but as you say it keeps the time in mind when the battery is full , so the capacitor still does its job

    easy test for a dead pram capacitor is to shut down the powerbook with full battery (or ibook as they have the same cap inside )and restart it after 15 seconds , if its holding the time its fine if its losing it , then time to change the capacitor
     

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