Energizer Lithium 123 Digital Camera Batteries (4-Pack) in the Device Replacement Batteries department at Lowes.com
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