Swytch electric bike conversion kit's new battery is pocket sized!
Fahrer Akku eBike Battery Cover: Universal, Tube - Electric Cyclery
Amazon.com : NC-17 Unisex Adult Connect Neoprene Motor Cover 4.0 | Protective Case, Motor Protection, Cover, Motor Cover for E-Bikes with Middle Motor and Integrated Battery | One Size | Colour: Black,
Fangqi »48V 13Ah E-Bike Akku Li-Ion Hailong Unterrohr für Universal 200-1000W Motor, mit Ladegerät und Batteriesitz, kompatibler Fahrradtyp E -City-Bike, E-Faltrad, E-Mini-Bike, E-Mountainbike« Akku 13000 mAh