A word of caution....some weeks ago, I tried this setup (with the battery case) and even I flown with it one time, the next times it didn't work anymore. When I turned on the RX, it lasted about 5-10 seconds before actually responding to the commands of TX and then they seemed very erratic. I checked out everything, switch, cabling, connectors and everything seemed to be correct. The funny thing was that testing it at home, sometimes it worked fine but then when I got to the field, the problem happens again, I even changed to another battery case but the problem presisted. It was until I used the battery pack from another plane that the problem went away. This battery pack has exactly the same type of batteries but soldered. My guess is that the mechanical contact with the spring of the battery case, maybe was causing some kind of RF noise/interference on the RX. Good thing this happened on the ground.

From my experience, I wouldn't reccomend using a battery case for the RX. BTW, I checked it hundred of times with my voltmeter even shaking it by hand or twisting cables and never got anything suspicious from it.

Regards,
Luigi