Hi there! My 20th anniversary P2 seems to have run out if battery. There's the battery with the X screen. Out of curiosity to see if I could save my tamagotchi, I took the battery out of my working V2 and put it in it, but the dead battery screen appeared again. Shouldn't it work for the P2, since it is good for my V2? I also put this battery in the V2 and it's running fine. Does anyone know what kind of problem this is?