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The Fenix ARB-L18-3500U USB rechargeable lithium-ion battery has a built-in USB port and can also be charged using an external charger. It offers an extra level of protection with an anode circuit encased in a steel housing, and as the battery is fully wrapped in steel, the risk of short-circuiting due to impact or collision is drastically reduced.  Note: This item is packaged and priced as one unit - one battery. 

Save on Fenix ARB-L18-3500U USB Rechargeable Li-ion 18650 Battery with a Fenix Store coupon

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The Checkmate extension automatically applies Fenix Store discount codes, Fenix Store coupons and more to give you discounts on products like Fenix ARB-L18-3500U USB Rechargeable Li-ion 18650 Battery.