No, it is not that easy. It took energy to get the car moving. Energy is lost in every conversion. In this case, electric to kinetic. You can't get back the energy that has already been lost. Yes, you can capture regenerative energy, using gravity to help charge a battery. But it would be at a constant loss, so there has to be a primary source of energy. The thing is, they haven't told us what it is yet.
I think the most likely is a hydrogen fuel cell that is replaceable. It is used to run a generator which charges the electric vehicle. SOMETHING has to charge the battery, and it cannot come from the energy already lost.
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