Danger of Pierced Smartphone Battery

Do you know what happens if a smartphone battery is suddenly pierced? At the site of the puncture, flammable gas is almost instantly released and the temperature rises sharply, causing the case to catch fire and even potentially explode. It is not recommended to extinguish such a fire with water, as it often only enhances the reaction. It is better to use a fire extinguisher, cover the gadget tightly with earth, or isolate it by covering it with something metallic.