Do u mean if the battery dies on it or do u mean the tamagotchi dies. Cause if the battery dies use a small screwdriver to unscrew it "if u have a techdeck screwdriver that works I prefer eyeglass screwdrivers though"then u should have a replacement battery that comes with ur tama if u dont u may have to go to wallgreens and buy another one
"hope this answered ur question"
Whatever u do dont throw ur tama away u can replace batteries!!!
read the directions.. you can either use a pointy object to hit the tiny black button on the back, or press and hold the A and C buttons until a new egg appears.