I have an electric bike with a 36v Battery. A month ago there was a problem with my bicycle, it stopped sending power to the motor, periodically. I took it to the bike shop and they decided to replace the controller. Ever since they replaced the controller, the bike started shutting down when going up hill (even though the battery is completely charged), when I was able to climb that hill on the bike with no problem before. The bike shuts down immediately, not going even 10 meters when starting up the hill. The bike shop refuses to believe the new controller is the problem, and tells me the problem is my battery. The coincidence of the two events makes me believe this is not true. However, the battery marker on the control pad does go down to the end when i am going up that hill, when before the controller was changed, it would only go 2 points down (there are 6 points on the control pad) How can I be sure what the problem is ? The battery is 1 year old. Along with the controller they also replaced the throttle, which I barely used. I disconnected the throttle, the problem persists. The bike storage is as follows: I ride it 5 kms a day , and it is either in my house or in the office, never in the sun.