Hey guys here's my gameboy sp modded inside an extra sega gamegear I had laying around, it all works flawlessly, even better it has the gamegear headphone jack working, the L and R wires are already solder to the board inside just waiting for momentary buttons on mail, "radio shack had clicky buttons that I know I would find annoying on games that would require L/R's.still plays original gameboy games. Auidio Volume also works off the gamegear stock Potentiometer and speaker.. also powers by the segas power switch.if you any questions abput the mod I would gladly answer..
((((((see it in action in youtube link below.))))))
http://www.youtube.com/watch?v=iph9l230 ... re=mh_lolz

take advantage of that extra space and put a huge-ass li-polly in it.

that's a great idea, although for now i'll stick with this battery since it still gives lot of hours of gameplay. but when its time to replace it, I will consider that..thanks