I've got four packs of A123's, two of 4S1P, and two of 6S2P. The ESC's are Castle creations, I've set them to reduce power at 2.8 VDC per cell which seems to work very well. The 6S2P packs are running at 52 amps, and are only 10 degrees above ambient after a flight. The 4S1P packs are running at 25-35 Amps, same temperature rise. As a rule, I never discharge them more than about 60% of capacity, to allow for aborted landings, go-arounds and the like.
As others have indicated, these cells give full power, until they shut down, and that is very rapidly.
I've been recording total amphours delivered from these packs. One of the 6S2P packs has delivered a total of 95 Amp Hours, with no loss of capacity or increased voltage drop under the 52 Amp load.
Don't EVER short these dang things! The battery will win, they WILL melt anything in their path! (Don't ask how I know)