Perforation of a lithium -ion battery (Li-ion) is very dangerous and can lead to serious injury. The punch causes an internal short circuit - the separate parts of the battery (anode, descent and electrolyte) united and begin to react uncontrollably. Heat can cause self -ignition or even explosion. Temperatures can reach over 500 ° C. The battery begins to pull out a toxic and corrosive smoke, which contains substances such as fluoride, metal oxides and organic solvents.