I wouldn't have good info on that. Most of our rides are 10 or 12 miles but only half of it is up most of the time - coast down. We did do 20 miles one time, 10 up. Batt had about 15% left when we got back.
Oh, did 22 or 24 with BarnBoy one time - about 1/3 coasting down. Batt was as low as...