I just bought a PowerBook G3 off of EBay and the battery is deader than a doornail. Where is the best place for me to look for a good replacement battery and can someone please explain to me exactly how I am supposed to be able to remove the old dead battery from the machine? I just can't tell how it is supposed to come out without me breaking the thing in the process and I don't want to do that. Thanks. Derrick