The Nitecore Sysmax D2 is a two-bay charger capable of charging two batteries simultaneously. This device automatically detects battery power status and selects the appropriate voltage and charging mode. The Sysmax D2 has an automatic shut-off function that cuts off power when charging is complete to avoid over-charging. The D2 is equipped with a crisp LCD display giving you a clear picture of relevant charging information. The LCD display shows the charging progress, battery type, voltage, charging current, and charging time in an intuitive and simple interface.