Battery model: ML2430 (3V) battery Battery Voltage: 3V Capacity: 100mah Battery size: diameter 24.5MM, length: 3.0MM Quantity: 2pcs Battery nature: rechargeable secondary lithium button battery Scope of application: real-time clock, alarm systems, PLC backup memory power supply, Fanuc FANUC CNC system, servo motors, machine tools, various measuring instruments, special electronic equipment and other electronic products, special lithium batteries. Battery retention period is: 10 years.