I have the kick set around 8.5W. The single coils seem to allow longer battery run time IMO. If I'm running a fresh batt from when I wake up and use DCs, I have to swap batts at lunchtime. If the same scenarion with single coils, I swap at the end of my workday. Dunno the variables of usage from day to day, so I may be off base.What wattage do you have it set at out of curiosity?