If you require a registration for portable batteries, you have to prove your participation in an approved self-operated take-back system within the registration procedure.
According to the battery law (BattG) every producer of portable batteries or their representatives are obligated to set up and operate their own take-back sytem for waste equipment batteries, to comply with the legal take-back obligations. This self-operated take-back system must be approved by stiftung ear.
It is possible for several producers or representatives to cooperate when setting up and operating their self-operated take-back systems by appointing a third party together. To fulfill your take-back obligations you can therefore also join an own take-back system that has already been approved.
You can find the approved self-operated take-back systems in this list: