I've been flying T-rex with lipos/brushless some year ago, but i never used protection just stoped flying before the power droped to much. But in that setup i used esc/heli/batt that were tested togheter so i never cared much about how things worked togheter. And i think my esc in the trex was 25-30A.

So now with this setup i don't know if i can use my lipo....still

//Magnus