A communication apparatus comprising: - a battery interface for receiving electrical energy from a main battery to energize the communication apparatus ; - a battery monitor adapted to determine a status of the main battery ; - a detector adapted to detect main charging events (ME), based on the determined status of the main battery , wherein a main charging event (ME) comprises a charging or a replacement of the main battery ; - a receiver adapted to receive an auxiliary status signal (AS) from a peripheral device external to the communication apparatus , wherein the auxiliary status signal (AS) indicates an auxiliary energy level (AL) of an auxiliary battery of the peripheral device ; - an estimator adapted to detect low-battery conditions (LC), based on the indicated auxiliary energy level (AL); and - a controller adapted to provide a notification signal (NS) for a user interface to notify a user of the detected low-battery conditions (LC); wherein: - the estimator further is adapted to determine notification triggers (NT), in response to the detected main charging events (ME) and in dependence on the detected low-battery conditions (LC); and - the controller further is adapted to provide the notification signal (NS) in response to the determined notification triggers (NT), characterized in that : - the estimator further is adapted to maintain battery data indicating the latest auxiliary energy level (AL) received from the peripheral device and / or the latest determined presence or absence of a low-battery condition (LC) for the peripheral device , and to determine the presence or absence of a low-battery condition (LC), based on the battery data when the peripheral device is not connected to the communication apparatus ; and - the controller further is adapted to provide the notification signal (NS) when the peripheral device is not connected to the communication apparatus . - a battery interface for receiving electrical energy from a main battery to energize the communication apparatus ; - a battery monitor adapted to determine a status of the main battery ; - a detector adapted to detect main charging events (ME), based on the determined status of the main battery , wherein a main charging event (ME) comprises a charging or a replacement of the main battery ; - a receiver adapted to receive an auxiliary status signal (AS) from a peripheral device external to the communication apparatus , wherein the auxiliary status signal (AS) indicates an auxiliary energy level (AL) of an auxiliary battery of the peripheral device ; - an estimator adapted to detect low-battery conditions (LC), based on the indicated auxiliary energy level (AL); and - a controller adapted to provide a notification signal (NS) for a user interface to notify a user of the detected low-battery conditions (LC); wherein: - the estimator further is adapted to determine notification triggers (NT), in response to the detected main charging events (ME) and in dependence on the detected low-battery conditions (LC); and - the controller further is adapted to provide the notification signal (NS) in response to the determined notification triggers (NT), - the estimator further is adapted to maintain battery data indicating the latest auxiliary energy level (AL) received from the peripheral device and / or the latest determined presence or absence of a low-battery condition (LC) for the peripheral device , and to determine the presence or absence of a low-battery condition (LC), based on the battery data when the peripheral device is not connected to the communication apparatus ; and - the controller further is adapted to provide the notification signal (NS) when the peripheral device is not connected to the communication apparatus . <EOS>