Id hazard a guess and say some of the turnigy 30C cells are good some are absolutely terrible.
I have 3 near new 30C 1800 2S, in a 200W pylon racer, 27A at full load static. If I go full throttle, and then put in full aileron, the LV alarm kicks off! They also dont hold balance at all, probably the worst lipos ive ever bought
5 star my ass