Ok, this question may seem a bit odd, but here it goes.
I discovered once, when I shut my computer down, that several things happened:
1 - The computer’s USB port remained powered, and my Clip continued to charge.
2 - Though the Clip was still connected, since there was no data signal from the PC, the Clip could play.
When I discovered this, I purchased a USB wall charger (a power brick that plugs into the wall, that has a usb port for charging) so I could plug my clip into my reciever and use it there.
My question is: when playing in the above state, where is the player drawing power from, the battery or the USB port?