Hello i bought a conversion kit some 20 months ago(www.lvbu.tech) However it died a few days ago. Almost certainly it is the controller. I have put a meter across the battery and that is showing a good charge. I had taken the controller to bits some months ago, and maybe it wasn't sealed properly so water got in and wrecked it? I am in the process of ordering a new controller from www.lvbu.tech which I think will do the trick. That is me and my electric bike at the moment.