If you don't spend a lot of time keeping the cable ends clean the advantage to more will ultimately be less. I buy the 31's for my pete and it uses 4 of them I buy the bigger CCA to give an edge when out in the cold I run from FL to the north and west in January MT,ID,WY the cables with the studs on top will take less maintenance than the post tops and easier to clean.I grease mine at installation and once a year after till replacement. Series just gives voltage parallel is amperage same size alternator will charge either way regardless of battery size the 27's won't give the life the 31's will.Every connection will cause resistence in the line also even clean.
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