Making internal ram work

im just trying simply for the game to save, and it does, but when i turn it off, for like 5 mins. i get the #### time/ day screen on my saturn and my save game on the internal ram is gone. can anyone tell me how to fix this?
look at the back of the saturn, you should see a small door

open this door inside you will see a battery, replace that

its a cr2032 @ 3v, and is the same as is used by the dc vmu's, and usually last upto 5 years in the saturn