The best SF18350 rechargeable battery in the industry 3.7 volts / 1100 mAh to fuel your SureFire 3-volt Dual Fuel illumination tools MICRO-USB charging facilitates charging via a variety of power sources The SF18350 is a Lithium Ion-protected 18350 battery with MICRO-USB charge capability. This allows the user to conveniently charge the battery using any USB power source such as a USB wall charger, computer/laptop, power bank, or automotive USB port using the included MICRO-USB to USB cable. Note: The SF18350 is compatible with SureFire Dual Fuel, single 123A-powered products. It is not compatible with non-Dual Fuel, single 123A-powered products.