Hmm... the same thing happened to me with my 12" aluminum. I just figured I was using the battery too much and bought a new one. I put the new one in and put the old one in storage. I was only getting 20 minutes on it, so I figured it was dead. I'll have to get it out of storage and see if 10.3.9 can resuscitate it. Karen Nakamrua (http://www.photoethnography.com/blog)
A Powerbook Battery Saga