Notice regarding battery disposal:

Batteries contain valuable raw materials, which are indeed harmful to the environment, but can be recycled. Old batteries must not get so in simple household waste, but must be disposed of separately. For traders is the legal obligation to take old batteries back, consumers are obligated to bring used batteries to a suitable collection point.

Batteries subject to disposal are seeing, which is printed on the packaging to the crossed out dustbin. Each under the dustbin symbol is the chemical name of the contained pollutant:

Pb = lead
Cd = cadmium
Hg = mercury