The invention refers to a battery pack (30) comprising a battery pack housing (32) and a battery cell (34) accommodated inside the battery housing (32) and a plurality of battery pack contacts (36) accessible from outside the battery housing (32) and electrically connected to the battery cell (34). The battery pack (30) is adapted to be electrically connected with its battery pack contacts (36) to respective electric appliance contacts (38) of an electronic appliance (2; 100) and to provide electric energy to the electronic appliance (2; 100) after connection thereto. It is suggested that the battery pack (30) comprises a card slot (40) in the battery pack housing (32) with a plurality of electric slot contacts (42) in electric contact with the battery pack contacts (36), and that the battery pack (30) comprises an electronics card (44) for releasable insertion into the card slot (40), the electronics card (44) comprising a wireless communication device (46).