I work in a mid to high-end independent bicycle store. It is a real

show with all the cheap things that people bring in wanting us to fix their junk. Unfortunately, there is a bunch of really really bad stuff out there. We turn away a lot of junk. people also complain that we charge more for a complete tune up / build than they spent for their junk online. There are plenty true accounts of what happens with cheap stuff with no or bad BMS (battery management systems). A bike store up in Amish country completely burned to the ground near here after they left things charging over night.