Specification: Brand:UltraFire Model : 18650 Voltage : 3.7V Rechargeable Times : Up to 500 times. Size:66mm x 18mm Capacity:4000mAh-May can not reach-it is normal in use. Over charge and discharge protection circuit. Color : Golden&Black.Features : Brand New and High quality. Safe and environmental friendly. Good packing and safe shipping for the battery. Suitable for laser pointer- flashlight torch and other electronics products.Package included : 2 x UltraFire 18650 4000mAh BatteryWe also have this sigle battery sold-click here.