Im almost positive the crystal has something to do with the time and/or date of the Gamecube. Now the Bios battery is wired to the chip that you relocate the crystal to, and I believe the positive of the Bios battery gets wired to the outer most pin, right next to where you have to relocate the crystal. I could be wrong so I would cheek Ashens rev c trimming guide, I think thats where I remember seeing something about the relocation of the Bios battery.