Bob, 3S is plenty on this plane. It's very feral and I'd be afraid that 4S would tear it apart
Here's a video of my plane's very first flight in gusty wind conditions. Sorry for the small plane size in the frame; it was hard to keep it in close due to strong wind, "new plane syndrome" and no flying in the previous 2 weeks. The plane is not trimmed out properly yet; I just did some quick elevator trim adjustments to stop it diving for the ground. This is a complete flight from takeoff to landing. The control responsiveness is just great and pitch authority is just insane
. This feels more like a balsa plane than any foamy I have flown.