The Fenix ARE-X2 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 ARE-X2 also features a USB port which allows you to charge other devices from charged Li-ion batteries on the unit (Ni-MH/Ni-Cd batteries cannot charge devices).