I was always unhappy with the battery tray on my last boat. It was one of those boxes held down with a strap and plastic clips. I ended up srewing it directly down but still was not happy with it. I wanted something that held the battery itself and didn't allow it to bounce around inside. So I bought this and it seems great for what I wanted. http://www.westmarine.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10001&storeId=11151&partNumber=2235562&langId=-1 Just one issue, my batter is a group 29 I bought from walmart. It's an everstart maxx and has served me well and is nice and cheap to replace when need be. It is about 1/2" too big for the tray and I can't seem to find a decent tray to fit it. So I guess my question is where can I get a good battery tray for it, or where can I get a group 27 dual purpose battery as cheap, and with as good a warranty, as walmart?