Cyclotricity 36v 7ah Lithium-Ion Battery seatpost mounted is ideal for bikes with out pannier racks, Optimum range is 20-30 miles between charges depending on terrain, weight of cyclists, frequent use of pedal assist, frequency of stops/starts, air pressure in tires etc, this battery situates neatly onto the seatpost right below the saddle. The battery slides in and out easily from its bracket which is affixed to the seatpost
Lithium-Ion 36v 7ah Seatpost Mounted Battery