Surefire Micro USB Lithium-Ion Rechargeable Battery - 3.6 V Output/3500 mAh Capacity - SF18650B

The SF18650B 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.