G'day Mate,
Yeah, I'm using this setup, & I may never need it, I have 2 packs both 4.8volts, 1 is 1700Mah the other is 1100Mah nicad, I also have an in plane indicator that tells me the lowest voltage that the receiver saw during a flight, & it has never gone below 4.8 volts, this is with a AR7000 RX.
But I'm pretty sure my RX voltage won't drop to an unacceptable level, so it stays.