Batteries are not to be disposed together with household waste. As end customer you are legally bound to dispose of used batteries according to the rules. After the use you can give batteries back to the sales outlet where you bought them, to municipal collecting points, to retail markets free of charge. Batteries or rechargeable batteries containing contaminants are market with this or a similar marking of a crossed out waste container:
Underneath the waste container symbol there is a chemical label for the contaminant - for example "Cd" for cadmium, "Pb" for lead, "Hg" for mercury.