I hooked up a Maxamps "True 150C" pack to my Flux XS over the weekend, did 3 laps of a little circuit we made with that, a Zippy 5000mah 30C and a Turnigy Nanotech 6000 65/130C
On a fresh charge, the Maxamps pack was the only one to go under 6v pack voltage from a standing start (max amp load of 140 amps)
so.. 150C? B...S! Just glad it was my mates pack and not mine!