I replaced both mine last Oct, went with the Sears Diehard Marine PM-2 Group 34, Deep Cycle AGM (I understand they are manufactured by the same company that makes the Odyssey battery). Too new to comment. I also installed one of the ProMariner ProSport chargers and keep them plugged in all the time when in the yard.
My original's were both the Interstate Cranking type and only got 3 years! I tried trickle charging using one of the small solar panels/battery during the off-season.
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