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Powerbook spontaneous shutdown not due to PMU -- aging battery??

Message #1 - Posted 2005/02/09 - Graeme Hirst

Is this a plausible symptom of an aging / dying / messed-up battery, or should I be looking for other solutions?

Computer: 12" G4 PowerBook (original version), 21 months old, running 10.3.7 (problem started with 10.3.6).

Symptom: When the battery level reaches approx 30% full, 0:45 left, it suddenly changes to 0%, and the machine immediately shuts down just as if the battery really were at 0%. When I plug in the charger, recharging seems to be from zero. But I haven't expended a batteryful of power; this machine used to make it through a 2-hour class with an hour of power left over, and now it can hardly make it through the first hour, with the battery's remaining time sometimes counting down faster than real time.

Not a PMU problem: I've tried the obvious stuff -- resetting the Power Management Unit, and calibrating the battery as per Apple's instructions.

I would be grateful for any suggestions.

\\\ Graeme Hirst
/// University of Toronto * Department of Computer Science \\\ * Voice +1 416 978 8747 * Fax +1 416 978 1455 /// * "Ancora Imparo"

Message #2 - Posted 2005/02/09 - DaveC

How old is the computer / battery? Probably a bad cell in the battery. Time for a new battery...

Please, no "Go Google this" replies. I wouldn't ask a question here if I hadn't done that already.

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