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What you want is a true deep cycle battery. You do not want a starting battery, or a hybrid starting / deep cycle (aka dual purpose) battery. If it says anything other than 'deep cycle', you don't want it.
To save money, I'd recommend a flooded style (will have caps for filling the battery with water), not a gel cell, or AGM. Neither gel or AGM will have caps for filling it with water.
I don't know what Autozone carries for deep cycle batteries. I looked on their site and only found starting batteries and dual purpose batteries. I tend to go to a store that specializes in batteries (Batteries plus, or a battery dealer), or a store that deals in marine stuff.
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