I'm personally thinking in a quite different direction-- that 100 kWh is pretty decent and that the advantage might be that an electric car with advanced batter

I'm personally thinking in a quite different direction-- that 100 kWh is pretty decent and that the advantage might be that an electric car with advanced batteries could be something quite simple, and something possibly quite cheap. The transition from a battery weighing 500 kilograms to one weighing 250 is something which I see as allowing electric cars from being highly specialized constructions to something needing much less care in their design. After all, there are ordinary cars with engines weighing 250 kilograms.