Well, then, you already got it . 1C is just understood to mean 1 X Capacity- in simplest form, you'd think you'd charge at 1.8 A for 1 hour, but that would slam the packs and possibly ignite them; the charger will actually charge to a max of 4.2V per cell at the set current, then it maintains the voltage while reducing current until the pack is fully charged (this is the CC/CV process you hear about: constant current first, then constant voltage to finish).