I have been using bosch 6 amp batteries, with moultons and crank drive and front wheel motors for 4 to 5 years. I try to average over 15 mph with legal speed with 250 watts.
time 01:00 distance 14.0 miles average 14.1 mph ascent 1,225 ft descent 1,250 ft
I return 1 or 2 bars remaining . Some...