Devil,
You will want a pair of matching batteries. You are probably better off installing 2 new ones - you don't want two unmatched batteries. You might consider two large 6 volt golf cart batteries hooked in series depending on how you plan to use your rig.
Shame you couldn't spend more time on the forum earlier to become a more informed consumer. Most of us have learned lessons along the way as we have moved from rig to rig.
My rig came with a single 12 volt battery but I installed 4 golf cart batteries fairly quickly as I do some boondocking.
In general RV dealers don't tend to be the best source for batteries. You will also need to add additional battery cables.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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