Battery relocation- Does anyone know of an actual hydrogen sulfide explosion incident?

I worked at a gas station years ago back when we still pumped gas and checked oil (mid 80s). I had left a battery on charge when I left at 4 oclock, and came back 3-4 hours later, the kids working night shift were choking on the fumes. hey said "oh is that what that smell is" anyway I think the fumes are what causes an explosion, the battery was bad and trying to charge it caused fumes. i remember thinking "that could have ben bad.