ORIGINAL: ChuckW
I try to put two batteries and two switches in parallel on every plane that has the room and can tolerate the extra few ounces of weight. It is good insurance.
I do the same thing even with my 40-size glow plane. my buddy who totaled his Pulse due to a weak battery still insist on flying with only a single battery.
These 2.4 GHz recievers are quite sensitive to voltage drops. Two batteries makes a huge affect on keeping the voltage good.