The Fenix ARB-L18-3400U USB rechargeable lithium-ion battery features a built-in USB port to charge without the need for an external charger, though one can be used if desired. Its anode circuit is specially encased in a steel housing, reducing the risk of short-circuiting from impact or collision due to the fully wrapped steel construction.

Note: This item is packaged and priced as one unit - one battery. 

Shipping Note: Lithium ion batteries are considered "dangerous goods" per US transportation regulations and can often only be transported via ground shipment. Orders containing loose batteries will typically take much longer than predicted to be delivered. Delivery times of 14+ days are not uncommon.