Both bikes have a 750w big magnet Bafang. The fatty's 750 is inside the stock 350 motor housing. Fatty has a 48v 30ah battery driving a 35 amp big momma 18 fet controller.
The Fold started life as a Foldx7. I replaced the stock 20 x 80mm rims with more sporting 24" x 65mm rims laced to a 750 Lindsey motor, which slightly increases overall gearing over a stock Fold. That still leaves the overall gearing a lot less than the fatty so it's able to make due nicely with just a 25 amp controller,
Both bike's lighting is powered off of the main battery.