NEW 4pcs UltraFire 10440 500mAh 3.6V Li-ion Rechargeable Batteries Battery Model No:10440 Color: Blue Capacity: 500mAh Voltage: 3.6V Voltage of full charge and empty condition is 4.2V 2.75V respectively Package Include 4PCS UltraFire LC 10440 3.6V 500mAh Rechargeable Battery+1pc Foming battery Case. Can be recharged over 500 times.