Jonathan Delfraisse wrote: > > I have a TI-83. How does the back up battery work? How would it work when I > change my batteries? Does any one have a address book for the TI-83 or > TI-82? > > Thanks. > > delfraisse@aol.com The mem backup battery makes sure your mem is stored while the calc is off. If you remove ALL batteries OR remove 1 of the 4AAs and press ON your mem resets