In a low voltage condition the receiver it will shed load across the board. In reality it's not shedding load, it has lost ability to distribute. The power buss in receivers is common so line loss is equal. A receiver does not automatically shed just the throttle unless something has been changed I'm completely unaware of. The so called "brown out" condition experienced by so many using 2.4 has been entirely due to over use of a battery, causing a full loss of control through a system reset as the receiver lost the ability to distribute adaquate servo power when the voltage levels dropped below a certain point. A little further drop in voltage and the receiver loses its ability to process signal.