This bundle includes the ARE-D2 charger and two (2) ARB-L18-2600 batteries. The Fenix ARE-D2 is dual-channel smart charger, built for different types, and different size, rechargeable batteries. The charger will automatically choose the correct charging mode for each battery type, whether it be Li-ion, Ni-MH or Ni-Cd. The high-definition LCD screen displays charging status and battery levels. The Fenix ARB-L18-2600 is a high capacity 18650 Li-ion rechargeable battery with a protection circuit in the anode to help prevent short circuits, over charge/discharge and over heating.