BTBAI 4X 18650 Battery Rechargeable 3.7V Li-ion for LED Flashlight Torch Headlamp 1200mah Blue top Button 18650 3.7V Li-ion Rechargeable Battery,1200mah capacity. Having an extra long life for all your battery powered devices Providing excellent continuous power sources to your device Can be charged over 500 times Low discharge rate, No memory effect