Thanks again guys.
Spad, seems as though I have got it now to the point that you just described: occasionally it just buzzes and with a little stick movement, the buzzing stops. Then sometimes it buzzes again, and then stops. So I will assume that that is probably the best I will get, and I won't worry about prematurely draining the batteries.

So is a RX the receiver battery?

And what is a DVM? "Somthing" Voltage Meter? My futaba transmitter has a built in Voltage meter but is that just telling me the voltage in the transmitter or does it also warn when the receiver battery is low? I assume DRPerre that you're telling me that the DVoltage Meter is what I use to test the receiver battery with to make sure it is not low.

Can I assume that the same voltages should be present for both the transmitter and receiver battery? I.E receiver alarm goes off when the voltage drops to about 8.7V.