It's by no means clear, that's the point. From battery to motor is fine for your ride within city limits but by no way a solved problem for long hauls. Energy

It's by no means clear, that's the point. From battery to motor is fine for your ride within city limits but by no way a solved problem for long hauls. Energy density, charging time and the problem, that even an exhausted battery has the same weight as a fresh one, are the issues yet to be solved.