I worked for a company that did this in the 1990's. Small gas turbine, the size of two show boxes (200hp) powering a generator, which charged the batteries and/

I worked for a company that did this in the 1990's. Small gas turbine, the size of two show boxes (200hp) powering a generator, which charged the batteries and/or electric motors. The advantages are efficiency, low weight and no gearbox is needed, as the turbine spun at over 100,000 rpm and the generator was fine with that. The main disadvantages were noise and turbines need more maintenance than piston engines. No LiIon batteries back then either. The project only built 1 finished prototype.