“A MacFixIt reader recently sent us a very thorough report on an issue that has occurred across several different iPods and a number of long conversations with AppleCare support representatives.
.The overall conclusion is that leaving an iPod in its dock (or, presumably, connected directly to a Mac via the dock/FireWire cable) while the Mac is asleep can drain the iPod’s battery.
Below are a few key excerpts from this reader report:”