The first one is Nates..the other one is roadys. Nates does let you charge 72 volts with a 36-volt charger. What is important here guys is the diodes. You must get that part right. They keep the current from feeding back into your controller. Nate has the right #'s. Nothing less. Same for roadys caps. Nate has done a 60 on 60 before. That is 60 volts at one time going stright to the motor. He is the only guy I know that can pull the front tires off the ground at 50 mph.