My new Fazua 250X battery that I ordered from Crow bicycles would not take a charge and was therefore destined for the landfill, so I decided to open it up see what is inside. Surprise! It has a hard plastic case that has to be cut off. The battery was not designed to be repaired. I’m still cautiously cutting with my Dremel electric disc tool so as of to start a fire, and when inside I’m not sure what I’m looking for. Anyway, the message is that “when your 250X battery no longer works as advertised, junk it”.