Just got home £40 worse off and feeling a bit pissed off. Bought a Belkin "TuneCast Auto LIVE", which clearly states on the box "Play music on your iPhone or iPod in the car while charging your device". When I plug it into my 4S I get a message saying "Charging not supported with this device". Works great for playing through the car, but a bit rubbish if it's going to eat my battery whilst doing it. Anyone else had this problem?