Hydrogen fuel cells instead of batteries? I don't think so.
http://www.flixxy.com/gm-hy-wire-concept-car.htm
http://www.flixxy.com/gm-hy-wire-concept-car.htm
Damn that's a sketchy site and old as hell video. I personally i would like hydrogen over electric if they both got the same power/mpg
Refilling from a 3,600-10,000 PSI gas bottle would bother me.
Never had any issues with paintball/ fire tanks. the main disadvantage would be the space it takes up