Lead-acid batteries contain lead, sulfuric acid, and other toxic chemicals that can cause harm to the environment if not disposed of properly. When batteries are improperly disposed of in landfills, the lead in the battery can leach into the soil and contaminate groundwater. Wildlife and people who come into touch with the contaminated dirt or water may suffer negative effects as a result. Lead can also accumulate in the bodies of animals and cause health problems.
Sulfuric acid is another environmental concern associated with lead-acid batteries. If the battery casing is cracked or damaged, sulfuric acid can leak out and cause harm to the environment. Sulfuric acid is highly corrosive and can cause damage to soil, plants, and animals.