Thie modern fast 1500w best 800w/1000w electric bike vehicle motorized scooter has swift acceleration performance, . In common plain road, 800w/1000w is advised to assure 25°/30° slope-climbing ability.Usually 60V20AH can assure 60km range, 72V20AH can assure 72 km range. bigger volumn battery is advised if you want longer range. In mountainous regions, 1500w motor & 72V30AH li-ion battery is advised to assure good 35° slope climbing ability on mountainous roads. if you want battery to be used for a long time, Lithium battery is advised. if you want cheaper battery, lead-acid battery can be used.