I have a locally assembled retail bike that came equipped with the Bafang M420 motor, which I've been happy with. recently the controller gave up after lot of riding in hevy rain. Into the shop where i bought it it went. And back it came, but not as before. The display (which was previously a C18) was still a C18, but now it was missing the different sport and eco modes it previously had. I was assured that the highest setting (5) should be just as powerful as 5 on sport mode previously. This was not true.
Problems:
I have notified the store, of course, and they are contacting bafang to look into if the controller they are shipped have changed and if there is something they can fix with programming, but I thought I'd check here if someone had any tips as to what can be wrong.
I also believe they have changed the display to an old one they had lying around, as there are a lot of scratches on it that wasn't there before, and it has a completely different start up animation. It used to say Max or HD or seomthing on a dark background, now it says BPS (i think, i forgot to take a pic of course) on a bright orange background.
Pictures of controller info and display info from the display:
Problems:
- Power usage about 50% lower than previously, measured by how long the battery lasts
- Very weak performance. Up hills where I would previously easily bike at 25kph, 17kph now takes a lot of work.
- Jerky and slow to react. Seems to be in a very low power mode until it suddenly "wakes up", but the power boost doesn't last
- There seems to be no coherence between torque I apply and how much power the motor provides. This used to be smooth, now it is anything but.
I have notified the store, of course, and they are contacting bafang to look into if the controller they are shipped have changed and if there is something they can fix with programming, but I thought I'd check here if someone had any tips as to what can be wrong.
I also believe they have changed the display to an old one they had lying around, as there are a lot of scratches on it that wasn't there before, and it has a completely different start up animation. It used to say Max or HD or seomthing on a dark background, now it says BPS (i think, i forgot to take a pic of course) on a bright orange background.
Pictures of controller info and display info from the display: