This is a very important posting to record more prominently than a comment at the end of a long thread... Apparently Vectrix had several project ideas for hybrid electric versions of the Vectrix, one of which was a fuel cell version
A serial hybrid design is very simple in concept - so simple that many people contemplate building them (been there done that). A serial hybrid is simply some kind of on-board electric generator connected so it charges the battery pack. Assuming the fuel to drive the generator has more power density than the battery pack it will give a range boost and depending on the fuel system it will let you stop at any gasoline station for a quick recharge.
Fuel cells are attractive because the only output is water. But they have a big problem - where to get the hydrogen? It's not like you can stop at any gas station to fill up because gas stations don't sell gas, they sell gasoline.
Anyway, interesting stuff. Too bad they're dying.