What battery for gameboy classic cartridges?

Narktor

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Hi!

I've found a huge load of tutorials on how to replace gameboy color batteries, but none for gameboy classic games.
I have already bought a package of CR2025 batteries (recommended for GBC games) but their diameter seems to be 0.5mm too big. The battery in my wario land 3 game cartridge is 1.5 cm in diameter, the CR2025 is 2cm in diameter. or would this still work?

Has anyone here already replaced a gameboy classic game cartridge battery?
How do I do it, what battery do I have to use?
 

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