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The Fenix 1600U 14500 is an incredibly unique battery designed with a built-in USB charging port. Skip the battery charger, this battery can be directly charged using a standard micro-USB charging cable. Designed to power high drain devices such as flashlights, lanterns, headlamps, and bike lights, this battery has a button-top and works in the majority of button-top compatible & AA battery required devices.Product Specifications:► Fenix ARB-L14-1600U Rechargeable Li-ion 14500 Battery► LED to indicate if battery is done charging► 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 / Over discharge protection------Short circuit protection------Overheating protection► 500+ Charge Cycles: A properly maintained ARB-L14 battery is designed to retain up to 75% of its original capacity at 500 full charge and discharge cycles.► Weight: 19g► Size: Diameter 14.5mm with a height of 50mm► Warranty Period: 12-month free warranty period from purchase date NOTE 1. This is a 1.5V Rechargeable Li-ion Battery. It can be used in any device that uses standard Alkaline AA battery 2. It is NOT a 3.7V lithium-ion rechargeable 14500 battery 3. The battery has a built-in charging port that can be charged through a USB cable. it CANNOT be charged in an external charger.