I want to purchase a 6G nano to use as an "always on" background music system for an elderly parent, in a "set and forget" fashion. It will remain plugged into the wall outlet, the audio output connected to a stereo receiver, playing started in Shuffle mode, and ideally not touched thereafter for a real long time. "On/Off" and Volume will be controlled only at the stereo receiver, and I want to simply leave the Nano always-on/playing. The Nano will be out of sight and hidden from meddling fingers. In this application the Nano's battery is effectively just a back-up battery in the event of a power outage. The question: Will the Nano remain on and keep playing uninterrupted in Shuffle mode while switching back and forth between wall-power and battery power (assuming the batteries are sufficiently charged)? I suspect the answer is yes but would appreciate confirmation from someone with hands-on knowledge. Thanks.