Recently I've heard of people in our region (central Europe) traveling around to buy used button cell batteries of all sizes and types for a moderate price. Thinking about the price, the batteries can be and should be recycled, but no official recycling site in our country would pay anybody to bring the batteries there.
Is there any motivation to gather used batteries other than recycling them?
(I have some ideas but don't want to influence the possible answers.)
I want to gather more information on this topic here because I don't like people doing this only for profit and (maybe) harming the environment carelessly.