... motor,36 volt/48v/ 60v 10 amp/14amp/20amp li-ion and LiFePO4 battery for choosing,and 2-amp charger. Electric bicycle conversion kit ... . basic functions: speed control , brake to cut off motor power, battery power indicator, 1+1 pedal assist system, speed limit Available ... freewheel for choosing. 7. Manual and ties. 8. 48v 10ah, 12ah 15ah rack lithium battery for choosing. 48v 10ah, 12ah 15ah Lithium ...