Rechargeable Battery on Gameboy Color?

Okay so I recently got into soldering and modding and all that good stuff, and I'm quite a noob so excuse me xD. Anyway, Ive gotten into nodding my gameboy color and Ive been looking into adding a rechargeable battery to the gameboy color.
One quite similar to this one: viewtopic.php?f=40&t=648.

I've researched for well over 2 hours now and I've seen people use psp batteries, lithium batteries, and more likely the gameboy sp battery and I haven't found any...well I haven't really been able to interpret any tutorials on this.
Does anyone know a list of items I would need to get for a project like the one above and how to do it?
As I said I'm extremely new to this stuff so sorry if this is a dumb question and thank you so much in advanced to anyone willing to help out!
 
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