The crystsal will not be next to the battery, it will be in the reciever box sticking out of the reciver. The crystal is a part that carries the frequency. If you look at the crystal ,there will be a number on it just like the one in the radio. You should'nt need to do anything since the transmitter and reciver will both have the same crystals( same frequency). IF you look at the box with the antena coming out, that is where you will find the reciver crystal.