Hi!
Nothing wrong with using 4,8V batteries for a Spektrum radio if you know what you are doing!!
I use "RED" GP NiMH cells in my pylon racers (4,8V , 850mAh). These are cells that can put out more amps than ordinary NIMH cells.
The new typ NiMH cells (i.e "Enelope" etc) can not put out as much power but will keep the the charge for longer periods of time so you will not loose as much power over time (but who cares when charging is no problem (I charge with my 30 year old , 50-100mAh
JR wall charger).
Some advise!
Don't use heavy standard servos in that small plane! Much better is to use Hs 225 typ servos and Hs 81 or 85 servos for throttle.
Light airplanes always fly better (and last longer)
