Battery Issues - late 2005 iBook

iBook sporadic with battery power. Works fine when plugged in, but if i unplug it shuts down. Sometimes it stays on for a while and then suddenly shuts down. I've also noticed a few times when i unplug if sleeping, move the computer to another location and plug in again I'm still up and running.
Based on other posts I've seen, sounds like might be a problem with PMU? Any ideas? Is my battery just toast????
Here's my battery info:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 3632
Remaining Capacity (mAh): 3505
Amperage (mA): 0
Voltage (mV): 16444
Cycle Count: 316
Any help is appreciated, thanks! Barry

My iBook was purchased in August 2005, and the battery finally gave out in June. Works great and all problems solved with the new one.

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