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Since you're running two batteries you have a few options. You can use one starting and one deep cycle, two dual purpose batteries, or two deep cycle batteries. Starting batteries should only be used for starting and never discharged, so if you go with option one be sure to wire in a selector that allows you to switch to the deep cycle when engines are off. Dual purpose batteries are cool because you can use them for both starting and powering accessories when engines are off. Like deep cycles they can be discharged and effectively recharged. Option three is fine also, since it's acceptable to use a deep cycle for starting applications, as long as the cranking amps meet your needs. Naturally they can be worn down and recharged repeatedly. Whichever way you go, it's always wise to switch to one battery when engines are off and you're running power to accessories. In the event that the battery dies you'll have the other to start the engines and get you going.
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