New(?) battery does not hold a charge.

I purchased my G4 iBook used. The battery percentage reads 95% full, but after disconnecting the power, it only lasts about 5 minutes until it is dead.
But the battery appears "new". Here is what the profiler says:
It is an Apple OEM battery.
Battery Information:
Charge Information:
Charge remaining (mAh): 2729
Charging: No
Full charge capacity (mAh): 2867
Health Information:
Cycle count: 43
Condition: Good
Battery Installed: Yes
Amperage (mA): 0
Voltage (mV): 16631
I don't know much of what this means, any help is appreciated!

So then the problem is the transfer of charge from the power source to the battery within the machine's power management unit. Sometimes resetting it can help:
http://support.apple.com/kb/HT1431?viewlocale=en_US
If it doesn't then, you need to take the machine in to service.

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