6 Replies Latest reply: Jan 22, 2009 2:51 PM by rb20044
rb20044 Level 1 Level 1 (0 points)
The battery on my powerbook won't charge up - despite resetting the Power Management Unit (...I never knew you could pick off the keyboard before). Any advice on next things to try?

Powerbook 1Ghz 17inch, Mac OS X (10.5.6)
  • Allan Jones Level 7 Level 7 (33,480 points)

    Find System Profiler in your Applicaitons . Utilities folder and run it. Select "Power" from the left-hand pane and post the info under "Battery Condition." That will help us determine the current state of your battery and whether is sounds salvageable.
  • rb20044 Level 1 Level 1 (0 points)
    The system profile says the battery is as follows. And it's been working fine until recently.

    Charge Information:
    Charge remaining (mAh): 0
    Charging: No
    Full charge capacity (mAh): 5893
    Health Information:
    Cycle count: 60
    Battery Installed: Yes
    Amperage (mA): 0
    Voltage (mV): 15961
  • Allan Jones Level 7 Level 7 (33,480 points)
    This line:

    Full charge capacity (mAh): 5893

    and this one:

    Cycle count: 60

    indicate that the battery is healthy. However, the voltage, at 15961, seems high. However I can't compare to my PB17 right now because my daughter borrowed it.

    Maybe someone who has their PB handy can compare their numbers.

    If the battery is healthy and the a/c adaptor seems to be working, that leaves the internal power circuitry as a suspect.
  • rb20044 Level 1 Level 1 (0 points)
    Thanks Allan.
    I suspect this may require some surgery...
  • eww Level 9 Level 9 (52,975 points)
    Allan: I've never had a 17" PB, so I'm not sure, but doesn't a full charge capacity of 5893 sound high too? What was the battery's original capacity in that model?

    In my experience, a Powerbook battery that reports a higher-than-original full charge capacity is at death's door, or at least can't be relied upon for much of anything.
  • rb20044 Level 1 Level 1 (0 points)
    I can understand (I think) that this might mean my battery has its problems, but would this explain why my Powerbook would decide not to try and charge it?
    It doesn't seem like a logical reason...to me, anyway. I'm always willing to be corrected by anyone who understands this stuff more than me!