PokéBase - Pokémon Q&A
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and how long would it take for a game boy game's internal battery to run out?

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Use This as a step by step instruction document to do it, it even gives the items you need to do the job.

You can tell you need a new battery when you can no longer save, it mostly takes a few years before you need to replace it.

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thanks, this will come in handy cause I just bought a game boy advance sp and some pokemon games, plus i've got an old game boy color.