Mine is bolted to the inboard face of F-814A-L-1, just forward of the F814G-1 seat belt anchor. The battery and wiring (with a fused output) are accessed by raising what ever rear stick base cover you may install. I can get in there by removing two #6 screws.
Not much to see Tony, just the battery laying on its side with the tabs attached to the rail. I think I placed a strip of rubber between the battery case and belly skin.