2 batteries don't get me far enough . and need some way of going farther --- My handicap don't let me drink ---I never let a battery run dead , and always swap out on the last bar --- If I knew how to 'Frankenstein' a generator to a 4 stroke flying horse and plug straight into the controller , or drag a trailer with a flex solar panel to charge a 3rd battery --- I just wanna go 100 miles a day on my rad wagon ---