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    Dual battery set ups - have I misused my own battery?

    Hi all, A while back (November 2017) i fitted my own dual battery set up. It wasn't too tricky, having followed a bunch of advice on here. I'm 100% certain that its wired well, appropriate diameters for the cable runs etc. I bought the Thunder DC-DC charger (cheapish) off ebay, and a 115Ah AGM...