Hard test lithium cans 18650, lithium polymer cans

Hello everyone, I offer you an informative video about the dangers of lithium-ion cans 18650, however, the batteries heat the video too much. I think in the usual way banks will not warm up. In my experience, the battery from the laptop was very hot, so it was dumb to hold, it was very hot, but there is at least some kind of protection against overheating.