The ARB-L18-2600U battery can be charged by its own USB port and by the charger as well.
The Fenix ARB-L18-2600 is a high capacity 18650 Li-ion rechargeable with a protection circuit in the anode to help prevent short circuits, over charge/discharge and over heating. The battery also includes pressure relief vents which expel waste gas in the rare case of an internal short circuit preventing an explosion.
