I have both the CH with built in syncro-spark in my Giant Spacewalker powered by a Zenoah G-26, and a CH-RCEXL that I run on a converted SuperTigre G51 in a 40 size SuperSportster. Both seem to use anywhere from 250 ma to 450 ma per hour of flight time. I am guessing that the variance is how hard I am running drawing more current for the increased rpm's. I have run the Zenoah on a 600 ma Sanyo NiCd pack for just over an hour and a half and it was still running. The pack needed 510 ma on my Triton to peak it when I got home. I now run Sanyo "Eneloop" 2000 ma NiMh's on both and never worry about how much I have left. Those will far outlast me. I am toast after about 2 hrs of flying.