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Just do the math!
Two 6v 100ah batteries series’d Together gives you 12v at 100ah. So expect to pay much more for one 12v 100ah battery. You’ll get the same output from the one 12v as two 6v’s. In my research (don’t take my word, do your own), One 12v battery is cheaper than two 6v when you compare total ah output. As an electrical engineer I’ve dealt with all types of batteries in various applications for the past 40 years. IMO I would never put a 6v battery on my RV!
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