Bravo great thread, at lot of good insight into a bigger problem than we want to believe. --------

The I4C on board Digital volt meter is a permanent piece of equipment on board my turbine aircraft. With that meter (very sensitive) you can spot a servo hanging up or overloading. I think if more of us had a clear view of Battery power and load or voltage under load there would be many more dual redundant battery packs used.

The first time I became aware of the potential problem was a D/F StarFire I flew a few years ago. It had 15 servos and at first I only had one 4.8 volt battery pack. When I saw how fast the voltage dropped to 4.5 / 4.6 volts it scared the $&*% out of me.

I think you have isolated a problem that is probably more common than we all might think. It does make since that the effective range of the radio could be affected under extreme power drains.

Another situation that I think may come up more often than we might think is low volt / power for the ECU battery. Put a digital volt meter on that circuit and that to will become an eye opener.
With the Jet Cat when voltage drops to 7 volts the turbine automatically shuts off. All it takes is a weak or low battery to have that kind of flame out. The flame out can be confusing if you don't have a real time meter so you can spot the low voltage under high current pulls, like going to full throttle on a turbine. The pump motor draws it's maximum current at high throttle.

I just wonder how many aircraft in flight problems / crashes are directly related to battery problems ??