Hydrogen vs. Battery Electric Cars

4:50 Hydrogen energy density when burning with oxygen is ~100MJ/kg or ~28kWh/kg. It's chemically impossible to get 35kWh/kg as you said. At best you get 28kWh/kg * 0.3% efficiency. And even that number of 8kWh/kg is completely wrong because it ignores the container mass, which is almost all of the mass! If you ignore the container mass for hydrogen, ignore it for batteries too. Awful. The truth, for anyone that cares, is that they're comparable.