Battery relocation- Does anyone know of an actual hydrogen sulfide explosion incident?
Dad jumped someone's else's vehicle once and the battery exploded (no-one injured). I wasn't there so I don't know if the cables were attached backwards or if it was a small spark made by not connecting the last cable to the block (or other area) more distant from the battery.
I had a Sears Die-Hard in the trunk of my '65 Valiant Bracket racer which was "enclosed" in a plastic battery cover with lid, but it was not vented to the outside. Fortunately, never had an issue (see photo).