HI guys,
   I went out and tested my new setup with the two Tech-Aero regulators and separate packs yesterday.  I flew several flights and when I got back home, I pulled the packs out to check voltage.  The pack that has always been there with a single regulator read the same as it usually does after 3 flights and the backup pack seemed to almost be at a full charge.  I check to make sure each pack is powering the receiver as described before by turning on each switch separately and then both on for flight.
  Maybe I had the wrong idea about this so I'm just trying to confirm.  How does this actually work?  Does the rx draw off the main pack that's plugged into the "Battery" slot on the RX and discard the pack that's plugged into a spare channel or does it draw off of both at the same time equally?  I would think if it was equal and assuming both packs started out at the same voltage, they would at least be close to each other.  The "primary pack" seems like it got used a lot more than the other.  How does this actually work for the RX?

Thanks,