Fenix ARB-L18-3500U Rechargeable Battery

The Fenix ARB-L18-3500U is a high capacity 18650 Li-ion rechargeable battery with a built-in micro-USB charging port. It also includes a protection circuit in the anode to help prevent short circuits, over charge/discharge and over heating. This battery can quickly be charged without the need for a separate charger. This not only save you money from purchasing a charger, but also convenience of not having to carry around another device. Fenix has increased its emphasis on safety by building in features to prevent short circuits and design multiple layers of protection. The new button-top design better accommodates a variety of flashlight brands. This will work in all of the models that utilize the standard Li-ion 18650, including best sellers like the PD35, PD35Tac, TK20R, TK75, TK15UE, etc.