Today i buy a Japanese, new, (and rare!) Kirby Block Pinball (JP) Its original, yeah, yeah... BUT...! The problem its the battery! I Solder/ put a new a battery! And works, but for example: I Create a new game (save) turn off Gameboy (Wait 5/10min.) And THE SAVE IS GONE! I Tried solder, put a new battery, and put another type of battery CR20XX, AND DOESNT WORK! WHAT IS THE PROBLEM! I PLAYED AND I WAS IN THE WORLD 5, AND MY SAVE IS GONE! AND ITS NEW THE F***** GAME! THANK YOU FOR YOU HELP.