Until recently I always used a connection that let my iPod (5.5G) be connected to my computer and a charger at the same time. Recently switched to just using a USB connection. I've left my iPod hooked up to my computer on several nights-probably for at least a week or more-while the computer is off. I knew obviously it wasn't chargng, but I assumed it wouldn't hurt it either. Well, today I unhook my iPod, try to turn it on, and it just flickers for a second and turns off. The battery was near dead. I'm charging it right now, but I'm just curious if that's normal-if it discharges when it's hooked to an unpowered USB port, and if so, why it's never drained it until today.