A follow-up to my earlier posts: Now that I have flown several hours with it, I am still noticing some interference from the battery-to-iFly cable, even though I'm using one with a choke now. The interference is still much reduced compared to the original cable.
I always use the same plane, but I remove my battery and iFly after every flight, so that means they get set up slightly differently each time. I have the ship's power cord running from stbd to port across the top of my glareshield, with the battery tucked up against the windshield on the pilot's side of the glareshield. The cable from the battery just drapes down the side of the wall, then loops back up across my left leg to the input at the bottom of the 720 (which I use in Portrait mode).
Depending on how close this wire gets to the handle on the yoke, I may pick up some interference on the intercom. With the original (unchoked) cable, It was tough to find an acceptable location for the cable--the best I could hope for was "minimal" interference.
With the choked cable, occasionally it will cause interference and I'll have to reposition it to get rid of it, but there are many positions where no interference can be detected.