Do Dual Batteries Have To Be The Same. It is best to buy two new batteries and install them both at the same time. At its most basic an automotive dual-battery system with the batteries connected in a parallel circuit essentially doubles the amount of electricity you have available.
Dual purpose marine batteries are batteries that have thick plates inside of them. Its currently setup with dual batteries both of which need replacing. However a handful of models out there require two batteries to function the most renowned of which are Jeeps.
If this happens you would have just wasted a perfectly good new battery.
I already have one new deep cycle marine battery but I can get a huge discount on another deep cycle of a different make. If this happens you would have just wasted a perfectly good new battery. From different Mfgs you can be assured they will have different chemistrys 1 more of this 3 less of that and therefore different voltages even 1V difference in design voltage will mean one will be undercharged or the other overcharged. Its currently setup with dual batteries both of which need replacing.
