18650 LITHIUM BATTERYAUXILIARY BATTERY LIFE UP TO 150KM. MG740 PLUS. 48V 20AH 18650 Lithium battery. Optional imported Shimano 7-level transmission system,customized aluminum alloy crank 46T large chainring,front 1 rear 7-level classic combination,SIS po- sitioning,durable 7-speed greatly enhances riding fun.
