The CR123A 3V Lithium Battery is a common battery used with wireless devices. Brand may vary from picture.
High capacity lithium battery
High capacity lithium battery
Honeywell 5816: Installing the CR123A Battery
Duracell Lithium CR123A CR123 123A 3V 20 Batteries
Enegitech CR123A Lithium Batteries, 123 3V Battery 1600mAh for Security System Camera Door Window Alarm Contact Flood Sensor Motion Detector Flashlight Laser Pointer Doorbell Non-Rechargeable 6 Pack : Everything Else
DURACELL HIGH POWER LITHIUM CR123 BATTERY 3V
CR123 lithium 3 volt battery
Qolsys IQ S-Line Encrypted Glassbreak Detector - SafeHomeCentral
POWCAMAH (3- Pack) CR123A 3V Lithium Battery 1400mAh for Cameras Flashlight Alarm Smart Sensors : Health & Household
8 Best CR123A Battery For Smoke Detector
Honeywell Replacement Back-up Battery For LYNX Series Controls - SafeHomeCentral
Honeywell 5800SMOKEV Wireless Smoke/Heat Detector - SafeHomeCentral
LogicMark Replacement Pendant Batteries (2PCK) - SafeHomeCentral
Rapthor CR123A 3V Lithium Batteries 20 Pack 1650mAh High Power CR123 CR17345 for Flashlights Microphone Toy Smoke Detector Alarm System Non-Rechargeable CR123 Photo Battery (Not for Arlo) : Electronics