I was 'playing' the other night with my Mini-Mag with the BadBoy400. (It's O.K. to play with them, right?) I fell asleep and the Mag ended up between the sofa cushions. I think it was on for about an hour, and I have to say it was quite toasty. Not too hot to handle, just plenty warm. The whole thing, including the AA alkaline cells. Guess I should be lucky that it wasn't a 5 watt device.
(Hell, I'm destine to burn in eternity anyway. May as well go with my lights on).