P-Book Charge light always amber

Discussion in 'Macintosh Computers' started by daveyc, Jul 7, 2004.

  1. daveyc macrumors newbie

    May 19, 2004
    Hi guys,
    laptop is 15" PB-G4 FW800 Model

    The other day, My wife left my PB Battery out and disconnected it from the mains, totally discharging the backup battery and loosing my settings.... :mad:

    Since this happened, when I charge my powerbook the charge light never goes to green. The battery indicator states 100% charge, I also found a console command to test the battery and yep, it's fully charged up....

    Also, the timer when charged stays on "calculating" for the time to charge up, but does display (and appears accurate) when the battery is discharging!

    I'm worried that my battery will be contiunously overcharged by this behaviour! Please help!


  2. mkrishnan Moderator emeritus


    Jan 9, 2004
    Grand Rapids, MI, USA
    It might have to do with the battery calibration. Try the re-calibration process:


    Basically, unplug, run on battery until the computer goes to sleep automatically, and then recharge it. When you plug the charger back in, at least on my iBook/G4, it will actually go green momentarily at 0%, calibrate, and then start charging. But hopefully then, when it reaches 100% again, it will go green again.
  3. daveyc thread starter macrumors newbie

    May 19, 2004
    Thanks! I'll try that now and post back on if it works.


  4. jasonmanthony macrumors newbie

    Jun 3, 2004
    Send it back to Apple


    I had the same problem, and also did the discharge-recharge solution to no avail. Talked with apple and they wern't sure so they had me send the whole thing in to be serviced. Turned out to be the power supply "brick" so they replaced it and all has been well so far.

  5. Judo macrumors regular

    Mar 6, 2002
    New Zealand
    You can also try restting the PMU.

    1. the computer is on, turn it off.

    2. Reset the power manager by simultaneously pressing and then releasing Shift-Control-Option-Power on the keyboard. Do not press the fn (Function) key while using this combination of keystrokes.

    3. Wait 5 seconds.

    4. Press the Power button to restart the computer.

    Good luck.
  6. daveyc thread starter macrumors newbie

    May 19, 2004
    Still no joy! :mad:

    I have discharged and re-charged fully the battery and re-set the power management....

    One thing that puzzles me is that I have held down shift ctrl apple and power, but it just turns the laptop on? same when I reset the P-Ram as well. :confused: All the keys work, but how do I know it's worked!

    Anyway, I've followed all the steps, but it still never stops charging, even at 100%.

    I have let the battery charge wit hthe laptop on and off, it still always stays amber, never goes green. Last night after re-setting power management I did get a timer to fully charged, instead of just "Calculating", but when it reached 100%, it then went to "calculating".

    Even when the laptop is off, the light stays amber, and the battery indicators top light is flashing. Take the battery out and it's registered as charged.

    HELP! :)
  7. Finiksa macrumors 6502a


    Feb 23, 2003
    Perhaps you should try Shift-Control-Option-Power instead, assuming you're attempting to reset the PMU.

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