JGovender

Going off what beatthecfa said...

Once you change the batteries, the calculator will reset. Once it resets you will need to reset your P/Y key to "1" by doing: [2nd] [P/Y] "1" [ENTER] [2nd] [QUIT]

The factory settings have P/Y set to 12 which converts the annual interest rate (I/Y) into monthly rates which is not what you want for most TVM problems.