Harm of waste batteries: When the chemicals in the batteries completely react, the batteries can no longer supply power and become waste batteries. Usually, people just throw it away and buy another one. Most people would say this is normal. But they didn't think that in that gesture, they were also destroying their home-the earth. Some people may ask, "What's the big deal for such a small thing?" ! What is destruction? "The battery doesn't look so destructive, but you can't see everything on the surface. Waste batteries contain a lot of heavy metals, such as mercury, cadmium, manganese and lead. When the surface cortex of waste batteries rusts in the sun and rain, its components will penetrate into soil and groundwater. Once people eat crops produced on polluted land or drink polluted water, these toxic heavy metals will enter people's bodies and slowly deposit, posing a great threat to human health! According to the measurement, one section of 1 battery is rotten in the soil, which can make one square meter of land lose its use value; A button cell can pollute 600,000 liters of water, which is equivalent to a person's drinking water for a lifetime. Nearly 5 billion people around the world lose a battery every month and accumulate 60 billion batteries a year, which can be said to be very destructive to the earth, and its consequences for human health are even more unimaginable. According to statistics, in Beijing alone, 29.6 tons of mercury enters the natural environment every year due to waste batteries, which is a headache. So waste batteries can't be discarded at will. All countries attach great importance to the recycling of used batteries. In addition, all kinds of zinc-manganese secondary batteries produced in developed countries are mercury-free batteries. Moreover, developed countries are not allowed to import mercury-containing batteries. Therefore, mercury-containing batteries in China cannot enter the developed areas in Europe and America.