I have got a bad habit of leaving my cd payer on sometimes in the car. Usually it's only for a couple of hours, but just out of curiosity does anyone know how long it would take for this to cause the battery to go flat? a.g. would it go flat if i left it on over-night? I know there's a way of getting the cd player to go off automatically when the engine stops but i dnt know how to do it, hence the reason I have this problem..thnx