Boule'tard posted this how-to some time ago, and I used it to base my mod. As he does it, the battery terminal leads were lengthened. I was able to leave my wiring stock by simply relocating a few things.
Here's the link:
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1259644714As for batteries, Boule'tard used a Motocross YTZ7S. I used the Batteries+ store brand equivalent. These are absorbed glass mat batteries. They do OK, but you'll get more amperage from a lithium ion. Ballistics are good, but you need a special charger. EarthX batteries come with an special charging circuit installed, so you can use any charger. I plan on getting an EarthX when my AGM dies. This is a decent read:
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1359344880/15My mod differed from Boule'tard's in a few ways. He welded threaded stock to the strap iron. I opted to use carriage bolts. Although I didn't have to weld them, it still required a bit of ingenuity. I also only made 3 sides on my box. The battery is insulated by some cut up bicycle inner tubes, and it's held in by 2 zip ties in the back. I check it frequently, and I've never seen any damage from it's environment. Surprisingly, it doesn't even get too muddy.
I can post a few pics that might help now. When I'm home in a few days, I can offer more.
A side peek:
Looking down from the left side of the bike. The positive lead is the one by the swingarm:
The negative lead was relocated here. The hardware was one of the battery box mount bolts with part of the washer ground flat:
The solenoid's new location - a small bracket cut from the side of the airbox. I did this to keep the side covers:
Outside view of the solenoid hardware. They are just some nuts I had lying around that fit:
The other half of the airbox I cut roughly 3 inches deep. I've been meaning to try my hand at fiberglass. I think this could make a handy toolbox/emergency kit compartment:
This is how she looks all closed up:
I hope this helps.