The present invention relates to a communication device, in particular a mobile communication device such as portable radio, which is powered by a removable battery. The power supply of the communication device may be maintained by connecting an external power supply to the communication device and powering the operating elements of the communication device by the external power supply during a replacement of the battery of the communication device. In this way, an uninterrupted power supply of the communication device is achieved. Thus, no shutdown or restart of the communication device is required for replacing the batteries.