So, I got tired of wasting all those batteries and decided to wire in a wall adapter to my remote controller for my airhogs helicopter. This allows me to run the controller off of an outlet and when it needs to charge I can still charge my helicopter through the controller without batteries!
Things you will need:
a 120VAC to 9VDC adapter, mine was also rated for 800mA - around $20 @ Radio Shack
Solder and Soldering Iron
Some 22 gauge wire
I used a "M" connector between my adapter and controller but you can use whatever you want or hard wire it, doesn't matter.