Automatic service machine for using and/or charging an energy storage device for an electric bicycle

The machine (1) has freely arranged machine housing (3) including a receiving chamber (4, 4') with access openings (5, 5') for a user for delivering and/or outputting energy storages (2). Cover elements (6, 6') close and/or release the access openings, and are locked by a locking system (7). An authentication system co-operates with the locking system for operating the locking system by an authenticated user. The authentication system includes a machine-side reading device (8) for an identification unit (9) carried by the user.