For a standard 4 cel 4.8v battery pack, what is the minimum voltage that a pack can have and still safely control the airplane? I have several different types of receiver battery led indicators that go from green to yellow to red, but I don't know at what voltages these change and what is too low a voltage to fly safely.

I currently have a battery pack that I have used on 5 different flights of about 7 minutes each and it still showed the green led in the far left position. I have left the receiver on for about 5 hours and it has only dropped down one led. I am concerned that the led battery monitor is defective, but need to have some voltages to measure against. I have a litco alpha 4 that I can run the "V" algorithm on to check the load and no-load voltage.

Thanks,

Terry