Abstract: A device for operation as part of a system or network, the device combining a power cell, a battery housing enclosing the power cell, and an on-board radiobeacon within the housing, where the battery is configured to supply DC power to an external apparatus and to the radiobeacon in parallel. A sensor or sensor package may also be included in the battery device and reports to the system or network. In response to a sensor or clock-derived trigger, a microcontroller in the battery uses the radiobeacon to broadcast messages to a radio receiver of a smart device or a network system. The radiobeacon has a unique identifier, and because the messages are low energy, low power radio transmissions having a maximum range of less that about 300 ft (about 100 m). Any smart device or network receiving the beacon signal may track, map and monitor the signal from the device.