Surefire 18650B Built-in Micro USB Rechargeable Lithium-Ion Battery.  3.6V - 3500mAh

  Charge. Win. Repeat. 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.

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