Battery "Full" but won't boot w/o AC

I've tried hard to find help for this: Clean installed Leopard over Tiger two weeks ago. Battery would hold 2+ hours, has 226 cycles, no issues. Two days ago noticed power issue: Power supply light is green from the moment it is plugged in, computer says batt is fully charged and all LEDs light up if I press the button. Original battery from 11/05, claimed a new one on recall, kept this one and used replacement until that eventually faded and couldn't hold charge >5 mins. 65W charger indicated in the profiler. Here's other info - note "0 cycles". I've reset PMU and PRAM.
Battery Information:
Charge Information:
Charge remaining (mAh): 65501
Charging: No
Full charge capacity (mAh): 65501
Health Information:
Cycle count: 0
Condition: Good
Battery Installed: Yes
Amperage (mA): 0
Voltage (mV): 10780
Can the computer suddenly become unable to run on battery?

Thanks eww. 15 times! I do think the (full) cycle count is correct considering it has had little use for half the computer's life span. I'll take the batt down to the local dealer for testing before making sure it gets well and truly forked... Having read a long thread about Leopard upgrading and charge issues on G4s, I want to ask you if you think there could be a data issue at all. Attempting to remedy the charge issue I reset the PMU (mac off, batt out, press on switch 5 secs) and then the profiler gave me cycles count while resetting time/date. Resetting PRAM had it disappear again, but the system clock remained set. And the batt LEDs all light up which agrees with the charge indicator. Would they at all, on a dead battery, or is that in line with terminal dementia of the battery pack?

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