Mglavin - I appreciate your insight in this area... I'm curious about the 22 mA current rate for 9 digital servos. I measured over 1000 mA, I think, the last time I checked. I put my ammeter in series between the battery pack and the receiver and measured the current. I began by unplugging all servos and then plugged them in one at a time and watched the current go up. This is especially useful when you are trying to determine if you have a servo binding with another servo. After all nine were plugged in I think I was measuring over one amp current draw. And the servos were all basically at rest, although supporting the weight of the surfaces. I am using JR DS8411 servos. This was a while back and perhaps my memory is incorrect.

Your math shows 22 ma times 30 minutes which is 660 milli-amp-minutes or 11 milli-amp-hours. I suspect you meant that the system draws about 1300 mA and after 30 minutes (0.5 hours) it has consumed about 650 mAh of battery capacity (1300 times 0.5).

And I certainly agree with your main point -- the best way to measure capacity is to fly a known time (30 minutes) and then measure the remaining capacity on a cycler when you get home.