Walmart is good for replacement at anytime, but Optima has a good deep cycle if you're willing to spend that much. Also, you can get TNT batteries in Cleveland. They're good and fairly cheap in price.
I just put two Interstates in my boat today. I went with the SRM-29. It has more reserve capacity (210) than the yellow top Optimas I took out. I haven't used them yet so i won't know for a while how they do. I sell them and the group 27's in stock at the shop so I thought I'd give them a try.
Ended up going with2 AC Delco 29 series for trolling motor and the 24 series (800 CCA / 1000 MCA) for cranking battery. Got all 3 from Jerome at Franklin Marine, he had the best prices. </p>
