It is easy to come into contact with harmful substances after touching batteries, so it is recommended that you wash your hands promptly. Batteries are divided into zinc-manganese dry batteries, lead storage batteries, and lithium batteries. Although the types are different, the zinc, lead, mercury and cadmium contained in them are harmful substances. Especially used batteries, because of decay and oozing of harmful substances remaining on its surface, the human body after contact will be stained with a large content of harmful substances, into the human body will damage a number of systems, such as cadmium will be irritation of the respiratory tract, liver and kidney hazards, leading to osteoporosis and softening, and so on. After contact with the battery should wash hands in a timely manner, or clean the contact area, cut off the pathway of harmful substances into the human body. It is recommended to use hand sanitizer or soap, if after washing hands still appear dizziness, vomiting and other symptoms of discomfort, timely to the hospital for examination, to clarify the cause of the disease, regular treatment.