RE: DX7 Crashed Two Planes
Every problem I have seen with the Spektrum stuff could be traced back to failures in battery or/and regulators
All but one - and that was a rx which quit on the bench-permanently
- and was replaced on warranty
Any pack which reads 4.8 volts is already too low.
If you really have access to A123 - balance charge two cells (1100 or 2300), these will read 7.2 v and operate at a nominal 6.6
I ran a number of DX7 setup and various power setup and use it for rx and servos Jr stuf does well on these.
On electric powered models I always used the EFlite ESC with internal SWITCHING type BEC on anything larger than a 5 oz foamy
A 4.8 v battery will work just fine with the Spektrums providing you have cells which will actually fully charge and operate at designed capacities -
Even in a 35% 3D model - seen it over n over but personally I preferred the A123 setups
Voltage needed is voltage under operating load - some cells collapse in tiny spikes and caause problems but they are easily checked using a quality in line meter.
The Spektrum stuf is as good as it gets .