content: The main problem with hydrogen is that after you produce it (which is fairly energy inefficient if you do so in a renewable way) you then have to compress the crap out of it, which wastes a ton more energy (unless you're storing it in metal hydrides which they're not here, and which I'm not sure if they ever really figured out how to do efficiently). Don't get me wrong, hydrogen is still usable, it's just way worse than simply using a whole lotta LiIon / LiPoly batteries, on basically every available axis.