Steve, doesn't seem feasible to me. Let's assume that they have a reversible fuel cell which can convert the water into hydrogen, and running in reverse can convert the hydrogen into electricity. You need 9 liters of water to make 1 kg of hydrogen, so you need a lot of water, then you need power to run the electrolyzer, I assume from a large lithium ion battery. Assuming that they recycle the water, they would still need a 20 gallon water tank, plus hydrogen tanks, plus a large lithium ion battery.
On the other hand, assuming they use an electrolyzer and fuel cell combination, they would not need hydrogen storage tanks, but would still need a large battery, and have two fuel cell systems. Again, doesn't seem feasible to me.
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