this is weird..

hi i stop playing tamagotchi a little while ago it was hard to quit.. lol do i have this blue V2 tama and it ran out of battery i pressed a button and it went all " ah.. " the tama did!! then i put a different battery it was kind of old too LOL then went all " whee " then i put an old battery from my V3 then it worked!! and it was old!! Then i took it out and put it back in and nothing happened no sound no weird dead battery working i swear this is true.. anyone have any reason why this could have happened @_@ LOL plz help if u know ty for reading