1. Mercury discarded in natural batteries will slowly overflow from the battery, enter the soil or water source, and then enter the human body through crops, damaging the human kidney. 2. The leakage of acid and heavy metal lead from automobile waste batteries can cause water pollution in nature and eventually cause harm to people. 3. Cadmium seeps out contaminated land and water bodies, and eventually enters the human body to damage human liver and kidney. It also causes bones to be soft and heavy to cause bone deformation. 4. One section of the battery is rotten in the soil, which can make one square meter of land lose its use value. A button cell can contaminate 600,000 liters of water, which is equivalent to the amount of water a person has in a lifetime. 5, in the human body is very likely to cause chronic poisoning, is a very toxic heavy metal, the main symptoms are emphysema, bone softening, anemia, it is likely to make the body paralyzed.