My girlfriend's PowerBook (the one listed below) has a strange problem - when its on its battery, it drains to about 38%, and then all of the sudden, it'll go to 0% and go into sleep mode. In addition, while charging, it does something similar (going to about 50-something percent, and then all of the sudden, going to 100%). She applied the Battery Update 1.1, and that didn't solve the problem. She's cycled the battery a few times, and nothing seems to work. Anybody have any suggestions?