I broke my ebikes motor 3 times(with lead acid battery) and now i have gone for lithium. Good speed and mileage. Well i haven't finished with the first charge yet. They had to do a few modifications to get the motor on as the old one had the back braking system, incorporated into the motor. This version rides so well i can actually ride better on the flat without switching the motor on at all :0) Thats good because i need the exercise :0) Now all i have to figure out is where to put the trailor attachment as the side that it was on before well it can't be put there again as there is not enough of the nut/screw space....ah well we will work something out. Just happy with a smoother/lighter running bike. Had a 20kg battery pack on this ebike because the original battery didn't go very far. The 20kg pack went for 80km i think ...