I am building a plane, and I am now putting all the servos in it. But there are a few things that I am unsure about. I am using my dad's old (7 year old) servos, reciever, transmitter ect. But I am unsure about the batterys for the reciever and the transmitter because they are so old. Will they still be good? I charged them and I havent got a chance to see how long they last.

Another thing, I am using a futaba radio, and a JR battery pack for the reciever. So there is a possibility of putting the pack in backwards and shorting the circuit (Which I did testing the servos). So I had to cut the wires, and solder new ones on. Looks and works okay, but one of the wires was black and really weak from the short, and I could not cut any further back. Will this be okay.

Will this thing fly? Or will I lose it from a low battery problem?

All this "Jimmy rigging" is making me unsure, but I am on a low budget so I guess I'll have to use the trial and error technique.