Battery will not charge, but works fine on ac.

I tried resetting the pmu, and using different ac adapters, but to no avail, sometimes the light on the power supply changes to amber, but the charge on the battery remains zero, any tips? (I press the button on the battery without the ac adapter and it flashes on the first green on the first LED for a few seconds and cuts out over)

Welcome to the Apple discussions.
When there are battery issues, typically one of three parts has an issue: the power adapter, the battery itself, or the logic board.
You can test your logic board using the OS X install DVD that came with your system (it will say in small print AHT Version x.x on it). Insert it, reboot holding the option key down, choose Apple hardware test, and follow directions.
How many charge/discharge cycles does the battery have on it? You can find this in the Tiger system profiler (click blue apple, about this mac, more info, power, battery information). Apple says a properly maintained battery should retain 80% of it's charge after 300 cycles. The Apple note on battery maintenance is http://www.apple.com/batteries/notebooks.html
Although different ac adapters didn't fix the problem, I'd assume they were working on other systems, so you've eliminated that as a cause.

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