Those darn "smart batteries" have chips so that they don't overcharge, but they must be stored discharged or they start to get confused. Try running it out to the end, then keep re-booting without the power cords to really empty the battery. Once it's truly empty it may realize it's time to top up again.
There is a software "fix" for this problem and we downloaded and installed this "fix" and the battery STILL won't charge. This is a 17" Titanium G4 Powerbook laptop. ( model A1039 battery). We updated the software to the latest build OSX 10.2.8 (6R73) and STILL no go! I guess we are going to have to bite the bullet and pay Apple's outrageous price for a new battery.
Hmmmm....Smart, but easily confused.
When did I become a battery?