As far as i know the output of the ESC would not be reduced in any way. So if you use the BEC of your ESC and an additional 4.8V Battery there would be 10.8V delivered to the receiver. This could blow up the receiver or even the steering servo. On the other hand the receiver doesn´t mind to just get 4.8V instead of 6V. That won´t hurt him.
What i meant was that if you use a seperate battery pack to feed your receiver then you have to cut the red (might be orange on some plugs, so I will write red/orange further on) wire off the ESC plug which you insert in your receiver. The black/brown and red/orange wire on this plug is just there to support the receiver with energy. The third wire (white/yellow) is the signal wire through which the ESC gets the information what he is actually supposed to do.
I hope you can see more clearly now. If not there surely will be someone to explain this again in better English.
My advice would be to just leave evrything with the normal BEC Voltage provided by the ESC.
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