I see. Doing my numbers on our feather Ive come to the same conclusion. 35C is not reachable outside lab conditions, let alone in a robot.

We run 4 A123s (so 13.2V) in our feather Hannibalito 3 (also a flipper).

With 2 speed 900s on the scorpion XXL I can do 2 fights back to back with it. The temperature is lukewarm at best so thats not much of a problem but the batteries are bone dry afterwards. I need to balance and charge them as soon as possible after that. So for 1 fight its fine, for 2 fights i would go with 2 packs for a feather like mine. I draw pretty much a constant of 20-25A.