ORIGINAL: Highflight-RCU
Of course. A 4.8v pack that reads 3v is toast. And I know it's not likely that a healthy 4.8v pack would be drawn down to 3v by a temporary servo load either.
And yet it has been shown to happen to JR/Spektrum systems. Which is one reason they came out with a plug in capacitor to smooth out voltage bumps and now advertise how fast their system re-binds when it has lost binding due to low voltage and it blinks the LED to show you that it went into a low voltage re-bind. So this is not at all unlikely.
What I'm getting at is that I'd simply like to see a situation where the receiver is the last to ''check out'' in a low voltage situation.
Which is exactly what happens with a Futaba FASST system. Run the voltage as low as is possible for any servo movement to happen and the radio remains linked to the TX.
Futaba on most radios also has a low voltage failsafe. If the RX senses a voltage of around 3.8 volts it moves the throttle to the low position. Cycle the throttle stick and it resets the failsafe and lets you land. It does not effect the other channels. Nor will it lose link, which I think is undesirable. But it will let you know when your RX voltage is dangerously low, but keep working while doing so.
So to correct my off-the-cuff low voltage point, it would probably be more practical if I were to hope for a 4.0v voltage seen by the 2.4ghz receiver before it drops.
For all I know, the Hitec RX's might work that low, but I haven't done enough research to know that, or whatever their lowest voltage variation is.
Futaba definitely goes well below that. JR/Spektrum now can go to 3 volts, but they will lose link and need to rebind, and I have no idea what Hitec does under low voltage. Again, why not contact Hitec, or Mike Mayberry in the Aurora 9 thread, and ask him.