Minimum batery to run the motor is 48v 16 ah with 44 teeth crack and 7 speed casette witch will have a top speed of 40 km\h widout any efort
Recomanded : 2 bateries in paralel to have double the power and it will run at max speed for long distantes
Recomanded : 2 bateries in paralel to have double the power and it will run at max speed for long distantes