Internal combustion engines tuned for hydrogen fuel also exist. However the benefit of a fuel-cell vehicle is being able to recharge the batteries with the fuel

Internal combustion engines tuned for hydrogen fuel also exist. However the benefit of a fuel-cell vehicle is being able to recharge the batteries with the fuel-cells, regenerative braking, or at a charging stations. https://en.wikipedia.org/wiki/Hydrogen_internal_combustion_engine_vehicle https://en.wikipedia.org/wiki/Hydrogen_internal_combustion_e...