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.
The first thing you want to do is flip the controller over and remove the batteries. Once they are removed, take the six screws out of the back and pull the case apart. You should see something similar to the picture. Take notice of the red and black wires coming from the battery compartment.