Battery Battery Size C Battery Chemistry Lithium Voltage - Batteries 3.6V DC Standard Battery Pack Size 5 Capacity - Batteries 8 500 mAh Battery Cross-Reference ER26500H Application Analog Digital LCD Clocks Terminal Type - Batteries Button Diameter 1.03 in Height 1.92 in Max Operating Temp 185 Degrees F Min Operating Temp -67 Degrees F Standards Listed MH29130 UL 1642 Package Quantity 5