Well mmmmm i have an Ibanez rg570 Sustainer equiped. and the battery is in a battery Quickchange by Gotoh. Really nice! fast and easy to change batteries. Its really worth it because you know all batteries trend to fail in A Gig
Then you just take out your replacement battery and make the quickchange!
The hole:
Well this one is Gotoh brand and it fits just fine, youll have to make a hole of course.
Hope this help