Battery regulation 
In connection with the sale of batteries and rechargeable batteries, we as a retailer are obliged under the Battery Ordinance to inform you as a consumer of the following:
You are legally obliged to return batteries. After use, you can return them to a municipal collection point or to a local retailer. Of course, you can also send them back to us for proper disposal. Batteries containing pollutants are marked with a symbol consisting of a crossed-out garbage can and the chemical symbol Cd, Hg or Pb of the heavy metal that is decisive for the classification as containing pollutants.
 

Pb = Battery contains more than 0.004 percent lead by weight
Cd = Battery contains more than 0.002 percent cadmium by weight
Hg = Battery contains more than 0.0005 percent mercury by mass

Please note the above information