Changing Battery on Casio Wrist watch - Data Bank?

There is a contact in the watch that needs to be connected to the battery for a moment to initialize the electronics. I know there is one called AC for All Clear, but I think that wipes everything. There is probably another that keeps the Data Bank intact. If you have the manual, it will show it and where it is -- so Target can do it for you. If you don't have the manual anymore, go to the casio.com site and download it, then take it back to Target and show them what they need to do.