PB battery charged but not working

I have a third party battery in my 15" Aluminium PB. It charges but doesn't power the Mac at all... It just shuts down straight away and messes up the date and time settings on reboot (rebooted using AC power). Any ideas?
Thanks.

Did the third-party battery ever work properly? If not, return it. If you post the brand or vendor of that battery, perhaps we can direct you to another model that may do better. If the battery came from an auction site, i would be very leery of it. Lots of reports of counterfeit batteries that simply don't work.
the date/time issues are due to a dead internal backup battery. Many Powerbooks ave the same issue but continue to work. New inernal batteries are nearly impossible to come by except for the latest PBs, and require a major teardown to replace.
If you get a new main battery that actually works then the dead internal won't be such an issue.

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