Originally the battery was located under the cab floor, but when I ran dual exhaust that pretty much eliminated anyplace under the cab or bed to mount the battery. That left putting the battery in the bed of the truck. I really didn't like the look of a stainless or aluminum battery box (and a plastic one was totally out of the question). I figured an old tool box would not look too out of place in the bed however, so that's what ended up serving as a place for the battery. As it turns out there is even still enough room to put a hand full of tools in it LOL.