I've got a problem which is like the reverse of yours Phil.
Over the last year or so I've been driving a lot of hire cars so I bought a SoundFeeder and used a plain cigarette lighter power lead. I usually connect everything up before I set off and but I don't necessarily start using it straight away so it sits there pulsing.
On a couple of occaisions I've tuned the radio, turned the SoundFeeder on and been greeted with audio. Upon pressing any button the display comes on and from the looks of it, the player has been on and playing for some time.
Anyone else seen this? I realise this probably isn't a common configuration.
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Cheers,
Andy M