SWAROVSKI OPTIK RBC AX Visio Charger with USB Cable for RB AX Visio Battery with Dual Charging PortsThe SWAROVSKI OPTIK RBC AX Visio Charger is used to recharge the RB AX Visio Battery. Starting at zero charge, it takes 3. 5 hours to get to 90 percent charge and 5 hours to get to 100 percent. The charger is supplied with a USB cable for getting power to the charger. It has ports for two batteries. One is supplied with the AX Visio Binocular.