RE: A123 - RX TO JETS
I can't speak for the FUTABA R6014FS in regards to using A123's, but I can tell you the Spektrum AR9000 has no problem in handling them. Also no problem's using the A123 3 cell on the Jetcat ECU...to date anyway!
Had to lengthen the charge/balance lead on the ECU pack...so snapped these pics before I installed it back in the aircraft.