RE: Hybrid power plant.
25 watts won't run a 1/6 scale tank unfortunately and the Ultracell unit is too big for 1/16 scale. I think fuel cell technology will get there eventualy but you will have to wait another 5 years for them to become a commodity item. The proce will drop then. 7-8 yrs from now we'll probably be pulling them out of old electronics devices.
Perry