Id rather replace two sixes in series with one single super heavy duty 12 volt n be done with it as theres less cables n connectins to go bad n worry with,,,,,,,,,,,less chance of one battery caniballizing the other (if in paralell),,,,,,,cheaper n easier......
Id use at least a 900 preferably a 1000 to 1100 CCA heavy duty 12 volt battery. Unless its extremelyyyyyyyyyy cold or the tractors worn out n hard to start, I dont think you need two 12's in paralell really as a single good heavy duty 12 ought to do the trick, but if not and you want two 12's for more cranking ampacity, buy them new equal n matched to lessen the situation of one feeding off the other.
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