We have a pair of Interstate RV/Marine Deep Cycle batteries in our Cyclone. We've been satisfied with them. If cost isn't much of an issue to you, a lot of people like AGM batteries which are sealed, so no water level to check.
We used to have two regular 12VDC flooded cell batteries. They lasted about 5 years, no issues. Now we have 8 120AH lithium batteries made by Elevation.
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