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.

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.
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.