that is a coo idea. you dont have to get a heavy battery to do it may a 1/2aaa cell if it is just for a boost. that way it wont be heavy. you will probably need to use a new receiver for that. you should look into glider or airplane receivers. they are often tiny so that the plane can fly with it, and i have seen some with as many as 8 channels! also while you are lookin at that stuff you can look for remote switches, ive seen them used for lights on helicopters and planes. if you have the cash for it, it doesnt seem like a bad idea or hard to do
i have been lookin into that stuff cause i want to add another servo to lower and raise my minix
... hit the switches!! lol