Let me put some display pics here...
@Henrik, the battery holder is still the same in the newer link 1000 so can be fixed by recycling from an old beolink or just order a new one from a dealer.
(I replaced the completely gone ones on my terminal, this was the only thing wrong with it due to battery leakage, just replaced the metal bits with clean ones fron other beolink bits and pieces...).
I think this terminal was sold as an 'extra' as equipment at that time came with either an audio- or a video-terminal, hence it could be there are not so many around ??