Question

and how long would it take for a game boy game's internal battery to run out?

Answer 1

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.

Comments

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.