I use one receiver....

On warbirds most of the time two battery packs and two stitches. (Mostly for balancing weight)

I also use the super switches that plug one battery into two slots on the receiver.

No Li-ion. (My field chargers work well for charging is I need to be at the field all day. (I use 2 Dymond chargers. One for the RX pack and one for the Ign.)

Simplicity is the key for me.