I would buy a $5 plastic battery box at walmart. It has a cover. You could pop a hole in it and install a female minn kota style female socket and the male end goes onto the troller motor wires. Leave it long enough so you can move the battery around. This would give you better weight distribution keeping the battery in ear the bow. This is where mine is, but there is a bow battery hatch on mine. If you absolutley want to keep the troller battery in the rear, if you have a floor you can snake two 6-8 gauge wires in black plastic loom (wlamart) and run it down the middle centerline under the floor. Thats how my setup came from factory.
I used this style Marinco male and female plug for my recent Bow mounted Terrova purchase:
http://www.amazon.com/Marinco-Conne...eywords=Marinco+Connect+Pro+Receptacle+&+Plug
On my last rig using that battery box set up with the female connector mounted in the battery box . . . I bot an extra male plug and wired it to a cheap black and decker charger. Then after fishing, I could plug in the charger without even taking the battery out or opening the cover.