I have 3 deep cell batteries. One of them is bigger (and newer) than the other 2. What happens if I try to use a big and small one together? What about putting all 3 together?
Go for it! Use one at a time or connect all three together. What's to lose as they are older and used? Yes good idea to use new batteries differently but older used, try it and see. I'd probably use the one larger one and then the 2 smaller ones.
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