RE: 50cc Sukhette Build Thread, now in progress!!
AR 9000 is fine, same as JR 921 and I've used the 921 a lot, works fine.
The charge lead on the A123s that I sell has 3.3v on teh signal wire, if you plan to plug it into the receiver you should cut the signal wire, it could cause some kind of problem.
In that size plane you don't need the third connection into the receiver, 2 will be plenty.
TF