content: Technically there is, the voltage probably has to be boosted, though. The real question, is how many times does that battery have to be recharged to make it to 500km? He's using a battery to split the water molecules, then combusting the hydrogen back into water for movement. Unless his engine is 110% efficient, he's going to have to stop and recharge the battery every 5 miles. I support your claim of shenanigans.