hmm; did someone say a 40 POUND power supply?!?! NO WAY DUDE! If that's really what I need, then I would say that's a MAJOR bummer! 4 hours on the ac/dc model?!?! SUX!!!!!! Is there not an alternative?? Say, something a little smaller, cheaper, and lighter?? Or am i REALLY gonna have to sit here for 4 hours charging a single battery?