Battery Battery Size CR2 Battery Chemistry Lithium Voltage - Batteries 3V DC Standard Battery Pack Size 1 Capacity - Batteries 900 mAh Battery Cross-Reference 5046LC DLCR2 EL1CR2 RLCR2 Application Gas Detector Terminal Type - Batteries Button Diameter 0.6 in Height 1.01 in Max Operating Temp 140 Degrees F Min Operating Temp -40 Degrees F Standards UL