Shows charging and syncs with pc, but does not charge.

I have an iPod photo that will not charge, so far I have:

1. Tried 2 different batteries (3 if you include the one that was in the iPod)
2. Tried several different cables (both apple official and others)
3. Tried 3 different charging bricks, and my pc (again also an Apple original brick as well as 2 others that are not apple branded (Samsun and Belkin if that matters)

The iPod shows it is charging and will sync music, but no matter how long I charge it the battery indicator does not go up, and the iPod actually dies while “charging”. All 3 batteries currently have no charge because they drained while the iPod was “charging”.

Short of using firewire to charge it (haven’t wanted to spend the money on one) I am at a loss as to what may be the issue. I have another iPod photo that charges fine using all of the cables and wall bricks that I tried for this one. The batteries I tried are also known working new ones. Any advice would be appreciated.