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Ok, I will have to be the first to disagree with the rest. I have several tractors running two 12 volt batteries in parallel and several tractors running two 6 volts in series. I run the highest cranking amp 12's I can find, and one tractor has optima gell batteries. I run Group 2 950CCA 6 volt batteries in the series tractors. As a rule when the weather gets cold around here the tractors with the 6 volt batteries always seem to start better under the same conditions. Not only that most of the time the two 6 volts are cheaper than two 12's. In my mind the two 12 volts have a lot of power for lights and will kick the engines over with a lot of power, but fade out pretty fast. The 6 volt ones seem to have a lot deeper cranking power and can keep the tractor cranking until it fires, a lot easier. Bottom line is either will work, I kinda like the 6 volt batteries in series vs the two 12s but I still have several of both. I really dont see how these guys are starting tractors in the dead of winter with only one 12 volt battery, must be something I am doing wrong, I think they would fade out pretty fast. I also run 90 to 130 amp altinators on all the tractors, I have a lot of haligon (sp) lights on the tractors, and the equipment runs a lot of power these days. I guess it is not as big a deal on the smaller tractors, but the bigger engines, like my 585ci Moline need lots of batteries to get them going in the winter.
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