Hello, I'm going insane over apple part numbers and compatibility. I know it's a lot to ask from MacRumors, but can someone give me a definitive list of iPod battery part numbers? I have a couple questions: Does the 30GB, 40GB, & 60GB 4th gen iPods all use the same battery? what about the 20GB, 60GB "color" models? Do the 30GB, 60GB, 80GB 5th gen iPods all use the same battery? Also, what is gen. 5.5? What is the part number for the "iPod video" battery? Does the 80, 120, 160 GB 6th gen iPods all use the same battery? Thanks for any help.