Interesting thread.

I am intending to provide redundancy in my latest EP project due to my first foray into 2.4Ghz and concerns (purley personal) about the rx "locking out" if the supply voltage drops momentarily. I appreciate that a lot of fliers regard this redundancy as not required but for the amount of £'s invested in this particular model I do!!! So.....

I will use a 4350 6s Lipo to provide motor power and this will also be connected, via a SmartBEC, to a spare rx channel (I use this setup regularly to provide rx power in my EP fleet but use the batt channel)
I will then add a separate rx Lipo connected via a Voltage regulator to the rx batt channel.
This will provide me with redundancy for;

a/ SmartBEC failure
b/ Voltage Reg failure
c/ Flight Lipo "failure"
d/ RX Lipo "failure"
e/ Pin failure of either rx input

What I'd like to know is how the rx takes power from the two lipos? I presume (probably wrongly!) that the rx takes power from the Lipo with the highest voltage. But as both power "feeds" will be regulated to 5v (one by Smart BEC, one by Voltage Reg), how will the rx decide which to use?!?

Although I appreciate this may be seen as overkill I really want redundancy for all the above and so any thoughts regarding the power draw is gratefully received