fuel cells have trouble being cheap, lightweight, high efficiency, and long lasting, all at the same time. I think this could have better scaling on all those dimensions, plus could use natural gas or propane or other fuels for when you don't have hydrogen

https://news.ycombinator.com/item?id=42745109

We detached this subthread from https://news.ycombinator.com/item?id=42745018.