Batteries are easy.
Here's the short version.
RV batteries aren't really 12 volt. We just call them that. They're closer to 14 than to 12.
Two six volt vs one 12 v is mostly a myth as it applies to rv.
Flooded batteries which you have to add water are a design form the 1890's
Agm and the like can lay on their side and require no water added on occasion but that's all they add to the system, no water added and the crap fest that can be.
Lithium batteries with internal sensors can be drained lower, essentially making them almost double the capacity of non lithium type batteries.
A special charge might not be needed for your lithium batteries since the big difference is a charger doesn't have to constantly 'tap' a lithium battery to keep it full.
Lithium is becoming an old but sturdy platform and newer better is coming.
Any investment in a $1,000 lithium battery today will be of great advantage, but might be $300 five years from now.
That's the battery nutshell without religion, prejudice, politics or laboratory strives wrongly translated to real rv life.
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