Blazin...here are a few photos of my 12v battery on my PA 14...I just used an old plastic battery box...you can get them at most auto or marine suppy stores.
I added a couple of wooden wedges to support the box since it sits on kind of a ridge of plastic...It puts the weight in a great spot rather than all the way in the back of the PA. You can fit a PWC battery inside the middle hatch but they don't have a very deep supply of juice...I use it for my Scotty Puller when hooping.
