About this item CR123A Lithium Battery Type: Non-rechargeable Lithium Battery, Voltage: 3V, Capacity: 1600 mAh ***These batteries are disposal batteries, please do NOT charge them Replace for: CR123, CR123A, CR17345, DL123A, EL123AP, K123LA, SF123A, VL123 Wide Compatibility: 123A battery is compatible with Flood Freeze Sensor, Smart Lock, Smoke Alarm, Smoke Detector, Water Leak Detector and other home alarm system devices. High Performance: Delivering up to 10 years of standby power, these batteries ensure your protection systems are always ready to perform when needed. PTC Protection: Built-in PTC protection (pressure, temperature, current) to ensure battery with high safety performance. Dimensions: 7.83 x 1.26 x 0.67 inches.