Anonymous
Cheap? This doesn’t fit the normal definition of cheap. You most certainly can buy quality samsung, Panasonic, LG, etc. 18650’s, 26650’s, which are protected and add even further protection in your build. Building them yourself is what makes them more economically viable.
I’ve been using li-ion for years and they have been as safe as lead acid. Tip, don’t buy a no name from China.