ORIGINAL: Aero330LX
In reply to you question about field charging...
If you are running 10 digitals you need two recievers to split the load. Not because of the batteries but simply so the Rx. lands will not get hot.
Just a technical correction.
With 10 digital servos, you do not need to run two receivers. Both Futaba and Jr have stated that you can easily run all digital servos on all channels on their receivers. Only if you start to exceed the number the of servos in relation to the number of channels on a given receiver do you need to think about using dual receivers, or using a matchbox with the separate battery for servos and receiver. Basically, a JR 10 channel receiver will handle 10-12 digital servos just fine. Same with Futaba. So, if you need 10 or 12 digital servos, use a 9 or 10 channel receiver, and not a 4, 5 or 6 channel receiver, and you would have a very good margin of safety.
As an aside, there were a few tests done where they ran 20 amps across a receiver (Futaba 9ch I believe) for a couple minutes with no ill effects. Much more than our receivers would even see in short peaks during a flight. Nothing burnt up, nothing got hot, everything worked.