Many many years ago I recall buying a number of caravans for my staff to work on sites around the UK. One needed the battery charging on site, so while the guys were using it, I had it on charge. The battery lived under a seat. The men complained a lot about the smell of rotten eggs at that time, blaming the loo and bathroom arrangements, but I later realised it was the gases from the battery, and they were smoking in that caravan too..............
Fronty LWB '54 reg 2.2i SE 16v petrol in very shiny black metallic