I find that I'll probably have to replace the three trolling motors in my '05 Ranger 621 this winter. I've hard that Cabela's runs a winter special of 50% off their stock of AGM batteries during that time. Considering that they're over $200 a piece, I would hope so!! But I see that serious guys swear by them. What' makes them so good? I just bought a new main battery for my boat (had to buy at the dock cuz my main died on my last trip) and it was an Interstate Deep Cycle Marine. Big monster thing with 750 CCA. I'm sure it could be used as a trolling motor battery but I think it's more of a house battery. Only cost $120 which I'm sure is more than if I bought it at Sam's Club or someplace not on the water. My point/question is, what's a good battery for trolling that won't bankrupt me and still do the job? Or could (3) more Interstate's be just as good as AGM's?