You are correct TOM, but since the subject wasn't about my problem I left in alone. I didn't want to divert the thread to radio systems and how they work.
But I will say this. My radio system is a JR 11X and servos are on separate channels. Two A123 at 2300ma ea. on the receiver and one a123 on the engine. The fail safe if programed to return all flight controls to neutral and the engine to idle. This happens when you loss link. If you loss total power to the radio you have no power for failsafe to work, but you still have power to the engine. the throttle may or may not stay the same. The flight surfaces will just flap in the breeze and down you go.
To have brown out both battery's would have to drop below 3.2v.
In my case when the engine lost power I always had control of the plane and was able to make a good landing. Had i had bad battery's it would have shown up on the ground when I did my preflight. I always check both battery's during the preflight by turning each battery off one at a time making sure I have control. Dennis