there are always two problems with Hydrogen, it wastes half the energy converting Natural gas to pure Hydrogen. and storing hydrogen in vehicles requires high pressure vesseles armored with steel containment armoring also and the "Fuel tank"combined with the fuel cells themselves cost more than Lithium Batteries with a similar energy capacity and there are no suppliers in my state or within 100 miles where I can get Hydrogen. Heck electricity is much more availability,the only purpose for using hydrogen fuel cells is perpetuating the use of a fossil fuel, natural gas... thus whis is a total waste of time and $5,000,000 Leave the fuel cells to NASA!