I'd like to change mine but am afraid it will wipe out all the settings and configurations? I have never changed it before but likely need to. I also have the 9-volt changed with fresh battery already in place.
It should not lose all your settings. It is there to maintain time on the board
see this link for all info related to iAquaLink- good reference for most any issue.
Welcome to TFP! For a wealth of pool care information please check out our free Pool School. If you are in need of specific help then we encourage you to Register and ask us here in the forum!