RE: Redundant RX packs are they overkill?
FWIW, I think you are far more likely to have a wiring/switch failure than a battery failure itself.. but no way to predict when something like a connector or switch fails.. Example...
I have twin Lion's on a wolverine with twin regs in a Jet.. we go fly... land, only one light is on on the switch...hmmmmm... No power on one pack... 0 Volts..... Na.... the weld came loose on the battery, but was making intermittent contact until it bounced around on the ground... jet flew fine on one 2600 Lion.. That intermittent contact would have been a total loss w one pack..