What is the best way to recycle your TX and RX batteries and how often do you have to.

Most cities and towns have made provision for disposal of TX and RX batteries. Your hobby shop or Radio Shack should also be aware of a method of disposal. It's time to dump old batteries when they will no longer hold a charge for a given period of time or will not reach their rated voltage when charged. Often a cycle and recharge will restore a battery that you have given up for lost.
If you are talking of recycle/charging. They should be recycled by the use of a battery dumper that will discharge them to a safe point before recharging. If you only use the batter for a short period and then recharge a nicad will develope a memory. Try to run it down to safe level before recharging. Just don't do it in the air.