[zeropoint46]

I'm actually not asking this tongue and cheek but do fuel cells weigh significantly less when they are empty? I would think that a hydrogen fuel cell would functionally weigh the same empty or full, so itd be the same issue as batteries, no?

[dragonwriter]

The new version of the Mirai has a fuel cell that weighs 25.5kg for the fuel cell and power converter and a 5.6kg hydrogen capacity, so proportional to the weight of the cell the fuel is significant, but proportional the weight of the vehicle, not really.