Seriously, figure out a way to incorporate this battery flipping technology into the wheels of a car so that they store electricity and then feed the energy back into the motor as needed.
It's called dynamic braking - the resistance from a generator charging the battery slows the car down.
My daughter's Altima Hybrid has regenerative braking. When you go downhill, it automatically transfers electricity back to the batteries. There's a gear you can shift into where the wheels act as a brake on a downhill grade, generating electricity that shows on a power meter on the dash. This stuff is standard practice for all hybrid cars.
Cars need to go to inductive powered / charged. Huge infrastructure but way cooler than running around with both ICE and batteries. Build nuke, coal and natural gas power plants. He’ll just keep the ones we have running instead ok killing all the jobs.