I used to work at a battery recycling company and one time I accidentally let one slip through and sent it off to the place where they do something with them in

I used to work at a battery recycling company and one time I accidentally let one slip through and sent it off to the place where they do something with them involving fire. This battery was maybe the size of a TV remote and caused an explosion. However, they are just about as energy dense as they get and happen to weigh nothing. But you can’t put it out with water if it catches fire.