If you relocate battery to hatch you need a sealed box that has a vent to go through your floor. Otherwise you get alot gas buildup inside your car. And of course you need wire to run to the back of the hatch, a fuse to put online, ground and maybe a distribution block. Steeda has a kit that I think is a couple hundred bucks.
Hatch Nation #9
"2 by 2 Hands of Blue."