Disregards servo when no load I'm mean when it's on the ground. Timer start from taxiing to engine shutdown after landing. Actually your servo load is based on the size of your control surface and speed. also weight of an aircraft affect energy requirements. Considering your data, take the ff:

milliampere hour requirements, mAh

mAh = average current consumption of all servo * time * 1000 * 1.25

time = flight time in hours


Power requirements = servo voltage * (full load current of all servo + 25% of highest pair servo current) / 80%

Let me know if you have any question.