Leave in the containers provided by the dealerships for this purpose. There is no cost to the user and no obligation to buy a new battery.
Button cell batteries

Button cell batteries
These flatter, coin-shaped batteries are used for watches, hearing aids and other electronic devices.
Where?
Battery bins
Which process is carried out?
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Specialised company
Treatment facility where valuable materials (plastic, glass and metal) are separated from hazardous or non-recyclable elements and decontaminated.
What does it become?
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Electronics
New batteries, stainless steel, electronic devices, etc.