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