The ICH-KDUAL-900 is a combination of the ICH-K-BASE and two ICH-KBP-900 battery plates. allowing the user to charge two Canon 900 Series batteries simultaneously. With the push of a button. users can switch between high- and low-voltage charge modes. and extra battery plates are available for charging different styles of battery. Plates can even be mixed-and-matched. for charging batteries of different styles and even different manufacturers simultaneously.