I didn't see any mention of efficiency as I skimmed through that video and the power out from the power in is a vital component.
We all know that petrol and diesel efficiency from the oil in the ground to the power to the road is pathetic and I would be guessing at 10% at best?
A lithium battery would be up around 95%? and this needs to be up there at say 85%+ efficiency or it will be short lived as technology races ahead.
