Make sure to use deep cycle, not starting or dual purpose.
Optima makes the best, but they are super expensive. You can get them for $200 each for the deep cycles at Sam's.
Here's what I'd do to get a great bang for the buck. Buy the deep cycle batteries from Advance Auto. They are $89.99, but if you buy online and choose store pickup, you can get $30 off of each battery with code RAF51112. They always have some type of incredible coupon code like that working. I'm replacing my two trolling motor batteries, and it will cost about $100.
As for duration, it's not like a cranking battery where the thing will be totally dead on you one day. If you have multiple batteries, you will just start to experience less and less power over time. Four years is a pretty good ballpark for when to replace. I replace at three, just because I don't want to have any reduced power.
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