Is it a X or V frame?
And about the battery, is this the correct position? Seems that CG is to much behind…
I use X for that frame a while ago and it works fine. I think V is referring to the 2 back motor angle. As far as the battery position goes, it’s all about balance. CG should be as close to under the flight controller as possible.
I have that frame also. It is designed for a camera in front, and I found with battery in rear and no camera, balance was too far aft. I simply have my battery on the bottom. This allowed me to out Telemetry and VTX in the rear part where you have the battery. LennyB01 is correct CG should be at FC area.