SureFire Micro USB Lithium Ion Protected Batterys. 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. Additionally an external 18650 compatible CC-CV cradle charger (not included) can be used to charge the battery; possibly at a faster rate if so equipped Specifications for SureFire Micro USB Lithium Ion Protected 18650 Battery: Manufacturer: SureFire Color: Black Condition: New Battery Type: 18650 Voltage: 13.6 volts Features of SureFire Micro USB Lithium Ion Protected 18650 Battery High-performance 3.6V 18650 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 3500 mAh for extended battery runtime 8-10A discharge rate for dependability in high drain devices such as LED flashlights Package Contents: SureFire Micro USB Lithium Ion Protected 18650 Battery SureFire SF18650B: Micro USB Lithium Ion Protected 18650 Batterys