Charge. Win. Repeat. The 18650 is a Lithium Ion-protected 18650 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. 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. 3.6 volts / 3500 mAh deliver extended runtime MICRO-USB charging facilitates charging via a variety of power sources 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