I have a question about the IPOD 40 and its battery life. I know there are supposedly "no moving parts" in the IPOD and when I've seen it a the store there are no battery compartments but my question is how long is the battery life? Not for single use but after a few years?? And becuz you can't take the battery out, what happens in a few years when the battery completely dies? Do I have to send it back to Apple so they install a new battery?? Or is it the fact that after a few years I can't replace the battery and nothing can be done to save it?? Help me! lol. Thanks.