The Fenix ARE X1- battery charger is suitable to charge the 18650- and 26650 batteries. You can easily connect it with the included USB cable. You can use it in combination with a full battery or as powerbank. This is how you can place a full battery in the ARE-X1 and connect your phone to the charger with the included USB cable to charge your phone.
The Fenix ARB-L2 18650 battery is of the highest quality. It is protected for under- and over charging and a high charging current is possible up to 2000mA. It is a buttontop and can, therefore, be used in flashlights of all brands.