Fenix Li-Ion Rechargeable Battery 2600 with built in USB Port

18650 batteries are perfect for powerful Fenix LED flashlights since they are rechargeable, have a long battery life, and can handle the power requirements of advanced LED flashlights. Fenix ARB-L18-3500mAh Rechargeable 18650 Battery Button-Top Design Protection circuit built in the anode with a steel hat by riveting process Steel shell eliminates the risk of short circuit caused by collision and impact Pressure Relief Vent: Expels waste gas generated by internal short circuit Expelling waste gas prevents a cell from inflating or exploding Three Sets of Over-Heat Protection: Over-charge protection and over-discharge protection Short-circuit protection Overheating protection 500 Charge Cycles: A properly maintained ARB-L18 battery is designed to retain up to 75% of its original capacity at 500 full charge and discharge cycles.   Button-Top Design Protection circuit built in the anode with a steel hat by riveting process Steel shell eliminates the risk of short circuit caused by co