Check the listing for details. Battery Replacement CR1616 + Game Bit, Pokemon Red, Blue, Yellow-Gameboy. Condition: New. Listed at 7.83 USD. This is a replacement battery for the Pokemon Red, Blue, Yellow games as well as a 3.8mm Gamebit tip to open the cartridge. (I also have batteries for other Pokemon games as well as cartridges for Nintendo NES, super nintendoNintendo 64, Sega Mega Drive and Sega 32X, see my ads).If your cartridge has problems backup, the internal battery is exhausted, you must change it to enjoy your game cartridge again.Changing the battery is very easy, you have to unsolder the battery in the cartridge and solder it in place, respecting the direction.It is a replacement battery for Pokemon Red, Blue and Yellow and a 3.8mm Gamebit to open the cartridge. (I also have batteries for other Pokemon games and for Nintendo NES, super nintendoNintendo 64, Sega Mega Drive / Genesis and Sega 32X cartridges, please look at my other items).If your game have saving problems, it's because the battery is empty, you need to change it to fix the problem.Changing the battery is very easy, you have to desold the battery on the cartridge and sold this one in the same place respecting the polarity.This is a replacement battery for the Pokemon Red, Blue, Yellow games as well as a 3.8mm Gamebit tip to open the cartridge. (I also have batteries for other Pokemon games as well as cartridges for Nintendo NES, super nintendoNintendo 64, Sega Mega Drive and Sega 32X, see my ads). Changing the battery is very easy, you have to unsolder the battery in the cartridge and solder it in place, respecting the direction. It is a replacement battery for Pokemon Red, Blue and Yellow and a 3.8mm Gamebit to open the cartridge. (I also have batteries for other Pokemon games and for Nintendo NES, super nintendoNintendo 64, Sega Mega Drive / Genesis and Sega 32X cartridges, please look at my other items). Changing the battery is very easy, you have to desold the battery on the cartridge and sold this one