My 71 Spitfire had the battery on a shelf built into the fire wall. Eventually the battery acid would eat a hole in the shelf and when it rained the acid would drip thru the hole and any passenger sitting there would get a nice hole in there pant leg. fun car to drive on certain days, but on others yikes. Reminds me of the old joke, Why do the Brits drink warm beer? They have Lucas refrigerators.
on one of the many jumps for my B, the tow truck driver somehow had to get the clips into the car behind the seats and somehow had the whole left side of the car smoking. I pointed it out to him and we just let that baby cool down for a while.
I had an MG that was built the same way. Once I had an engine fire that started when the B+ that transits the firewall shorted out, filling the cabin with acrid gray smoke.
Good times.