I put these 6s 4500mah through a Twin EDF FMS A10 and they held up superbly. I rang them out with full throttle passes and never showed signs of sagging, always gave the power demanded. At the end of the 3-minute cycle of hard pounding on these, I would say they are good to go. I'm looking forward to more testing and see how long their service life is. So far I really feel confident I will be buying again. For the price, they are definitely on point.