Handheld radio communication device for wireless communication for an emergency service or a military use, comprising: a transceiver configured to receive wireless radio signals and transmit wireless radio signals; a processing unit electrically coupled to the transceiver and configured to process the received radio signals; and a power supply configured to provide electrical power to the transceiver and the processing unit, wherein the power supply comprises a removable battery, a power connector and a switch, wherein the power connector is configured to be connected to an external power source, and the switch is configured to selectively provide electrical power to the transceiver and the processing unit either by the removable battery or by the external power source connected to the power connecter, characterised in that: the power connector comprises a locking mechanism configured to lock a connector of the external power source when the removable battery is removed; the switch is configured to automatically connect the transceiver and the processing unit with the power connector when the external power source is connected to the power connector; and the power supply further comprises a power converter comprising a transformer for galvanic isolation of the power supply of the handheld radio communication device, wherein the power converter is configured to convert a voltage of the external power source to an internal supply voltage of the handheld radio communication device. a transceiver configured to receive wireless radio signals and transmit wireless radio signals; a processing unit electrically coupled to the transceiver and configured to process the received radio signals; and a power supply configured to provide electrical power to the transceiver and the processing unit, wherein the power supply comprises a removable battery, a power connector and a switch, wherein the power connector is configured to be connected to an external power source, and the switch is configured to selectively provide electrical power to the transceiver and the processing unit either by the removable battery or by the external power source connected to the power connecter, characterised in that: the power connector comprises a locking mechanism configured to lock a connector of the external power source when the removable battery is removed; the switch is configured to automatically connect the transceiver and the processing unit with the power connector when the external power source is connected to the power connector; and the power supply further comprises a power converter comprising a transformer for galvanic isolation of the power supply of the handheld radio communication device, wherein the power converter is configured to convert a voltage of the external power source to an internal supply voltage of the handheld radio communication device. wherein the power supply comprises a removable battery, a power connector and a switch, wherein the power connector is configured to be connected to an external power source, and the switch is configured to selectively provide electrical power to the transceiver and the processing unit either by the removable battery or by the external power source connected to the power connecter, characterised in that: the power connector comprises a locking mechanism configured to lock a connector of the external power source when the removable battery is removed; the switch is configured to automatically connect the transceiver and the processing unit with the power connector when the external power source is connected to the power connector; and the power supply further comprises a power converter comprising a transformer for galvanic isolation of the power supply of the handheld radio communication device, wherein the power converter is configured to convert a voltage of the external power source to an internal supply voltage of the handheld radio communication device. the power connector comprises a locking mechanism configured to lock a connector of the external power source when the removable battery is removed; the switch is configured to automatically connect the transceiver and the processing unit with the power connector when the external power source is connected to the power connector; and the power supply further comprises a power converter comprising a transformer for galvanic isolation of the power supply of the handheld radio communication device, wherein the power converter is configured to convert a voltage of the external power source to an internal supply voltage of the handheld radio communication device.