Not even 5 minutes of battery life !

Hi All
I have a 2.5 year old Powerbook G4 15". The problem is with my battery. Over the course of the last six months, the battery capacity has significantly decreased to the point that if the power adapter is now unplugged for even a minute, the computer just shuts down instead of going to sleep ! I am assuming that's because the battery does not have enough juice to power the computer even when it's in sleep mode ?
I checked the battery info as provided by 'System Profiler' and I see the following which makes no sense to me:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 65472
Remaining Capacity (mAh): 860
Amperage (mA): 0
Voltage (mV): 12288
Cycle Count: 643
How can the full charge capacity of a 4800 mAh battery be 64000 ? And why is the Amperage being reported as 0 ? It sounds like something is seriously wrong with the battery.
Anyway, on to my questions:
(1) Will resetting the PMU help in any way ? I doubt it myself but just want to make sure.
(2) I am pretty sure I will have to buy a new battery at this point. I went to the Apple online store but they have a backlog of 2-4 weeks on a Powerbook G4 15" battery (hmm, may be everyone is having battery problems ?) ! I really don't want to wait that long. What do people think about the Newertech Nupower High Capacity Batteries offered by OWC ? They seem to have gotten good reviews since they were releaseed but I it would be good to hear from people who have actually used them.
Thanks in advance,
Nitin
PowerBook 15, 80GB, 1GB Mac OS X (10.4.8)

What you're seeing is a lithium battery that is about to die. It's not unusual for a lithium battery to have sudden power dropoffs at the end of it's life. With 643 cycles on your battery, it's not surprising. Also, it seems when the batteries are about done, the battery capacity numbers get flakey.
You can certainly reset your PMU to see if it makes any difference - won't hurt anything.

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