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Precisely... Now if it had a small gas engine it would be different but then most hybrids and electric cars already have regenerative braking.I assume the writer is claiming that the car is using the spinning hub and belt to drive a generator to recharge the batteries. That would not work, because perpetual motion machines don't work. Running the generator would put resistance on the wheel. Overcoming that resistance would require drawing more power from the battery, so it would be self-defeating.
However, from the picture, it's not clear exactly what that gizmo is for.
Keep in mind that this is an all electric car and does not have an auxiliary gas engine.