High-performance Surefire protected 18350 lithium-ion rechargeable battery with Micro-USB port for ease of charging - no charging cradle needed.When plugged into a power source, two LED indicators display the current charge state: Red for charging and Green for fully charged. 8-10A discharge rate for dependability in high drain devices such as LED flashlights. 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