Abstract: The mobile telephones comprise two main elements, namely a body (101) and a battery (103) the powers this body. The users of the mobile telephones may wish, through their mobile telephone, to have functions other than that of communicating with another person. These other functions (107-109) are then incorporated into the battery and a functional connector (120) is placed between the body and the battery. In order to keep a body that is as standard as possible, the functional connector is made detachable. The functional connector then sets up a connection between the contacts (116) of the body and contacts (111) of the battery. Thus the body is the same whatever the type of battery. Similarly, the cost of the telephone is henceforth bone only by those who have need of it.