Using it causes the heat. It is in an insulated container so the heat stays around for about 4 hrs I think he said. So applying first charge must heat it to me

Using it causes the heat. It is in an insulated container so the heat stays around for about 4 hrs I think he said. So applying first charge must heat it to melting temperature but then it's working. Then when you discharge it, electron flow cause heating again. So if it is constant use it just works.