I have (5) PowerBook G4 15" Aluminum batteries that I no longer need, since I now have a MacBook Pro. They are all running at well over two hours of charge, and work very well. Here they are in order of usage, from least used to most used:
Battery #1 ($90)
4356 mAh remaining capacity
2 cycles used
Battery #2 ($80)
4306 mAh remaining capacity
38 cycles used
Battery #3 ($70)
4194 mAh remaining capacity
60 cycles used
Battery #4 ($60)
4168 mAh remaining capacity
143 cycles used
Battery #5 ($60)
4138 mAh remaining capacity
145 cycles used
Price listed includes ground shipping. Please PM me or reply if interested in any of these batteries. Thanks!