Try this!
Need a super light Rx pack?
Buy a 9 Volt rechargable battery.
Cut the casing...and pull off 4 or 5 cells for a nice 150-170mah battery pack for your really small stuff!

I use smallest radio shack slide switch i can find in the line right to the Rx. If you get the 6 pole switch you can wire it for a charge jack right off the switch.

Hope this helps!
Anyone else done this?

High Flights!
CrazyHerb