Could this be the future?

[gwing]

150 Wh / 36 V = 4.16 Ah sorry I was probably doing something else when I typed that in

The hydrogen was given as 150 W + 150 W buffer battery = 300 W

Have a closer look and you'll see it's 150Wh capacity for the battery but 150W (not Wh) from the hydrogen generator ( i.e. it can produce 150W to either drive the bike or charge the battery until the available hydrogen runs out). The actual Wh capacity equivalent is going to depend on how much energy can be extracted from the tank's hydrogen and I've no idea what that would be - considerably more than 150Wh I would think though.