Official Dewalt 18V Lithium Battery Vs Cheap Ebay Generic Battery

TLDR: the cheap ebay battery no longer works on my high power saw after only about 15 to 20 cycles and ~1 year of ownership. I'm also worried that the strong vibrations of the saw could damage something inside if its cheaply made, leading to a fire risk. I will not be buying another generic battery for my dewalt tools.