My boat came with 2 batteries and the blue sea 1,2, 1&2 switch. They have Marine Cranking on them, Interstate Cranking battery and then a sticker with 24M-XHD 800 CCA 1000 MCA. Seems to me these are both just cranking batteries. Looking at the Interstate site I didn't see a spec for amp hrs. Am I right about them being just cranking batteries or are they deep cycle as well that that will give me a few hours of play time on the stereo? I want to add a another battery, would I need to buy the same type battery? I would like to get away from the type you add water to and go with a AGM or gel type. Could I buy one of those and use it with my current setup? Also would I just hook the new battery and my stereo battery parallel. I would like to also find a wiring diagram for a 3 battery system with the switch in the equation. Thanks
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