If the DUO is like the firmware upgrade made to the0610iNet, the added store functionality is what seems to be causing confusion about discharging. If you select a % at which to store the batt and going in, batt is at a higher capacity than the selected storage value, charger will discharge at minimal amps (300ma) to bring it down to the store value through the balancer. There is no discharge capability per se like the Ice charge has. That is the same reason I kept mine also to keep that discharge capability.