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I agree. It works for me because I have a “house” battery for camping.Noco 10A here, for a dual battery setup. You only need a 1X charger for both batteries. The batteries are in parallel and charge at the same rate with a single charger. The 2X charger will only use one of the outputs and the other will be idle; it's the way they are designed. It won't hurt anything, but one bank will not function when hooked in parallel and it will not put out 20A.
If you have two separate batteries, (not hooked in parallel. rather like in a boat using two batteries in series) then each battery will absorb 10A max.