Looks like I need to replace the cranking battery for my 04 225HO - the group 31 Dual Pro Lightning I have is testing bad (400 CCA, should be 1200 CCA). Since Dual Pro no longer makes batteries, and my next choice (Delco Voyager) aren't made in that big a size (as far as I can tell?) any suggestions? Motor is on a 03 521dvx with the usual electronics. Anything a tad lighter would be good - the Lightning is a beast! BTW This was installed when I bought the boat in 05, so I suspect its original - 5-6 yrs is not too bad I guess.