A friend of mine wondered if- you had two batteries in an all electric car (big ones), both hooked up to a generator on the wheels. The car drives for a bit using only the power from one battery (battery#1) to power the car. Then, when battery#1 runs out of power the car switches to battery#2. Now, while battery#2 is powering the car, battery#1 uses the spinning action of the wheels (along w/ the generator) to put some power back into battery#1. Now, I realize that you could never get all the power back from both batteries, but wouldnt it be able to go farther than one huge battery that holds the same amount of power as batteries#1 and #2 combined due to the generator replacing some of the lost energy of one battery while the other is working? If it does work, will my friend be able to not worry about his idea getting stolen since i've posted this before anyone else, and i know the date too?