I just bought a 74w NewerTech battery about 3 weeks ago but I don't think that is the problem....

I can run my iBook off of the AC adapter fine but when I unplug it it automatically shuts off as if there is no battery in it. It shows that the battery is charging and everything in the menubar but when I unplug it, it will shut off. This just happened today and earlier today I was working on it with the battery working fine. I also switched out to the old stock battery and it does the same thing. I think it has to be hardware related. I have reset the PMU and PRAM/NVRAM and it didn't help. Also when I started the computer back up it said that my clock was reset. Feedback is much appreciated.

iBook G4 14" Mac OS X (10.4.10) NewerTech 74w Battery, 1.5gb ram