Just finished another flight test with my 5550mah battery. 100% throttle almost the whole time, made it 30,153 FT one way, total flight distance 75,160 FT, 24:28 flight time, with a light crosswind. My auxiliary battery had 7% left at the end and TB48 had 9%, I was thinking of having a 7400mah lipo built. My 5550mah weighs 702g a 7400mah would weigh about 940g, I'm not sure what extending the TB48 battery will do as the auxiliary batteries seem to discharge at an equal rate, maybe once you get over the capacity of the TB48 it will be needed, has anyone tried an auxiliary battery larger than the TB48 and tested what's left in the auxiliary? Also does anyone know what weight of auxiliary battery is the limit were the benefit of extra capacity is negated?