ORIGINAL: SeamusG
How about the use of a capacitor with a Rx-compatible plug. Will it in any way be of benefit for a battery pack with a sour cell?
You would need a very, very large capacitor for that. A capacitor can however filter out the deepest voltage drops, and could prevent the RX from going into to safe-mode prematurely. A proper selection of capacitor will need an oscilloscope for analysis of the voltage supplied to the RX while moving the servos.