Abstract: Rechargeable battery (4) for mobile, personal devices, such as mobile telephones, smartphones, PDAs or E-readers, which have an internal antenna (1, 9) for electromagnetic near-field communication by means of RFID, NFC or similar standards. The rechargeable battery has an intermediate antenna (2), which communicates contactlessly with the internal antenna (1 or 9), and an external antenna (3), which is connected to the intermediate antenna (2) and communicates towards the outside, wherein the intermediate antenna (2) and the external antenna (3) are applied to two opposite side surfaces of the preferably exchangeable rechargeable battery (4), and the intermediate antenna (2) is arranged in the communication range of the internal antenna (1) when the rechargeable battery has been inserted into the mobile device. The intermediate antenna (2) and the external antenna (3) and the connecting lines (5) thereof are integrated into a label (6) applied to the rechargeable battery (4).

Abstract: An identification document which is linked to a person, particularly for the authentication of authorizations or qualifications of the person is provided. The identification document includes a mobile communication device which is able to show images and assigned to the person, including a display unit, an operating unit and a memory, wherein an identification dataset that is stored in the memory is assigned to data which are stored and administered in a central database, and wherein an optical recognition attribute that is assigned to the identification dataset can be displayed on the display unit of the communication device.