I base my CG off actual balance points, not by what I move. The numbers I gave were approximations. I'm more certain about the CG shift than the amount I moved the battery - actually, it is well over 2" because they were overhanging from the battery tray, so it is 2" plus the overhang, so maybe 4".

But the CG changes I marked on the wing. Each flight I shifted the batteries back a little until I got to where I felt the flight characteristics were deteriorating. In this case I was getting a bad tuck in KE and the plane was diving a little during rudder corrections. Both are characteristic of a rear CG. So that set my rear limit, then I worked forward until I was happy with what I had and went one move farther to prove I was where I wanted to be.

It is a nice advantage of electric. It's very easy to make small adjustments. One downfall is that you need batteries of equal weight and need to be sure they are in the same place each time. I have not implemented anything into my plane to make sure that happens yet, but I should.

I just lost one of my 5s packs so now I'm wondering what will happen with an eventual change to larger packs, and how the extra weight will impact flight characteristics.