hi all , i have an arrma granite 4+4 i purchased a hobbywing 1060 brushed esc for it . I run a 2 cell 5000 mah in it , however after only running a few minutes it reduces engine power way down , and if i turn it off then back on its fine for a minute then same thing , now i did run the lipo in it with it set to nimh batt by accident not sure if it damaged it or not. Battery is full balanced charged before each use .. please help