> batteries have a long way to go to even come close to power density and weight of kerosene or gasoline aviation engines. It is possible to use hydrogen or ke

> batteries have a long way to go to even come close to power density and weight of kerosene or gasoline aviation engines. It is possible to use hydrogen or kerosene based fuel cells instead of batteries http://figures-of-speech.com/2018/04/fuel-cell.htm http://figures-of-speech.com/2018/04/fuel-cell.htm. Another advantage of electric airplanes is that for them it would be much easier to takeoff and land vertically.