Just got my BetaFPV 85X 4K!!! I already have the 85x and the 85x HD. Burnt esc on one on 4s lipo and had it replaced. Running only 3s on them now. BUT before it caught fire, it was an amazing flight! So, BetaFPV says this one fixed the issued with running 4s with esc and motor change. I will fly this weekend and find out!