Post no. 5646 of 8/10/12?
2ndly Bill if you have a radio that can take a FRsky module- try that. I use it on my Futaba 9 & 10 C. Works like a charm and most inexpensive way to 2.4 . Tx module with 8 channel Rx costs about usd 60.

LiFe batts come down to 3.3V/ cell within few min. Or seconds and remain at that for 80%+ of their life. You can check it. So a 2S life is actually a 6.6V output not 7.2 going to 6.6. 1 diode is fairly sufficient.

My double switch with fuel filler, 2100 2s Life batt, optokill with LED and the diode cost less than USD 50 landed.