Like I said I didn't run my retracts seperatly.....what is meant by 2 switches is you're running 2 batteries a switch for each...either battery/switch is capable of powering the system but if you lost a battery/switch you lost half your available amps and no way of knowing it.....
So to keep things simple....run a single 2200 to 3000 mAh battery to a switch then the battery port on your receiver......monitor the amp draw of your retract carefully and base your recharge time on that......
Now if you want some back up...then 2 batteries and 2 switches...either way run your retracts through the receiver....just monitor your batteries carefully so you know how much you can fly on a charge