I agree on the idea of making
I agree on the idea of making a smaller battery to yield a range of 300 or so miles. As Timothy Parker notes a 200lb battery would mean that an EV would possibly 150-250 lbs lighter than an ICE vehicle.
As to the predicted energy density of 9.65 times current densities, we will have to wait to see if this can be a commercial product. OTOH, even a simple doubling or tripling of energy density will create a disruption in the EV market that will spark a huge migration to EVs.