Good point, maycam. I feel like a right daft slapper now for even pondering that it might be true. I hope I've not wasted anyone's money who went out and bought one of these things!
if there are actually 4 big batteries inside each one (which makes sense) then you could hook 2 of them up to your remote control using some chewing gum, wire and a bit of sellotape.
It would guarantee a talking point at family gatherings at the very least... haha