Correct me if I'm wrong, but aren't there quite a few types of batteries of the modern era which when they catch on fire are extremely hard to extinguish? We have had much training on this on the boats with certain types of batteries in equipment. It's also why the planes don't want certain types of batteries in the hold. A car battery, being do big, just needs to be submerged I guess. It actually took me a while to work out what that first picture was Al. Imagine trying to put out a fire at one of those big battery storage facilities!!!