Here's my Hangar 9 Ultra Stick 30cc setup -
AR9350 receiver 9 (using all 9 channels)
(8) metal gear digital servos (throttle, rudder, (2) ail, (2) flaps, (2) ele))
Tech-Aero IBEC [ignition battery eliminator, isolation & remote fail-safe]
Spektrum 3,000 mAh LiFe Rx battery
Switch (on/off/charge)
gas engine
tank/filter
very simple, using modern, reliable & safe battery chemistry with IBEC. No need for the extra weight of additional batteries, plus the IBEC supports remote kill from Tx and/or mechanical Kill from manual switch.