various methods , systems , and devices for identifying a low battery charge of a smoke detector are presented . for example , a device may include a smoke detection sensor that detect smokes and , in response to detecting smoke , generate a smoke detection signal . the device may include battery test circuitry that tests a charge level of a battery installed in the smoke detector device . the device may include an audio output device that outputs a low battery chirp in response to the battery test circuitry determining the charge level of the battery installed in the smoke detector device is low . also , the device may include a proximity detector that monitors for a wave movement of an object within a distance of the smoke detector device and generates a proximity detection signal when the proximity detector detects the wave movement performed by an object within the distance of the smoke detector device .