It is common for Vendors to rate capaicty and C much greater than their true numbers.
The industry standard
for capacity is based on the 0.2C rate.
Cycle life is defined as the point in that test at which the cell delivers 60% of the rated capacity (as measured at 0.2C)
Now if you get a typical flight of 5 hour from a single charge this is very useful imformatation. Close to two years ago I stated that capacity based on less than a 3C discharge meant nothing to electric flyers. 3C is 20 minutes and yet many ststed tha a 1C discharge graph/test was necessary to determine a cells true capacity.
The capacity game is much the same as the cycle life game. Manufactures graphs show 500 cycle ilfe but if you look closely the 500 cyclles are based on discharge rate between 10C and 0.5C and they do not say how many at each dicharge rate.