Until I came to this forum, I'd have been in the "dumb" category about batteries. I've carried loose batteries around for over 30 years with no problems. It wasn't until I got into vaping, that I was exposed to batteries designed to put out lots of power quickly. If it wasn't for this forum, I'd still not have a clue that you can't treat the batteries we use like the disposable batteries most people are used to. Even the rechargeable batteries in electronics are different than the 18650 you put in your mod, and designed to put out a steady, slow amount of power over time. Even with those batteries, shorting them isn't a good idea, I know.
One thing we need to understand about "common sense" and "common usage" is largely, our electronic equipment is designed to "just work". There is very little to no technical knowledge required about how it "just works". Just slap in the power source, and away you go. That doesn't translate to vaping very well. Especially when we're using equipment that is using electricity to perform a job in a very basic, mechanical manner. Most people see the word electronic, and think digital. Not electronic as in this is just some wiring with a switch to create a circuit that runs through some material that provides some resistance and creates heat. When you think about it, we're basically putting liquid filled light bulbs to our face and lighting them up lol.
I bet if you took someone totally clueless to electronic cigarettes, and gave them a disassembled mech mod, they would be confused about how it works because there is no chip present. As I write this, and look around my small office, the only thing in here electrical that works closest to a basic e-cig is a light bulb and I bet that a lot of people, especially younger people, don't even know how they work. They just do.
Shops and sites that sell equipment need to do a better, more focused job of explaining battery safety to their customers. Vaping has moved beyond the tinkerers and hobbyists that know stuff doesn't "just work" and out into the realm of the general public that expects everything to "just work". Battery safety shouldn't be asteriked off from the rest of the product description, at the bottom in a smaller font to look like fine print. Rather it should be in big bold highlighted section. Required reading during checkout on a website, or required topic of discussion at the sales counter.