I think quality control as well as actual engineering standards are lacking. I bought a high end EM3EV battery for my new ebike conversion, and it’s fully twice

I think quality control as well as actual engineering standards are lacking. I bought a high end EM3EV battery for my new ebike conversion, and it’s fully twice the price of other options. But it’s made very well and it’s not going to burn up my bike or my house.