CR123A 3V lithium battery is used for instruments gas meters water meters electricity meters battery cameras etc
Streamlight CR123A Lithium Batteries | Bass Pro Shops
Amazon.com: Duracell CR123A 3V Lithium Battery, 6 Count Pack, 123 3 Volt High Power Lithium Battery, Long-Lasting for Home Safety and Security Devices, High-Intensity Flashlights, and Home Automation : Health & Household