I used the Hobbico HD switches on my Yak and the Ernst receptacle for charging.
http://www2.towerhobbies.com/cgi-bin...&I=LXE963&P=ML . I usually charge one receiver battery at a time through the receptacle/switch harness. To charge both at the same time, I take the canopy off, unplug one battery from the switch and plug directly into the battery plug. Unplugging one battery takes it off the common connection inside the receiver.