Yes, when you add cells the internal resistance of a lead acid battery typically increases. However, the 12 volt battery (6 cells versus 3 cells for the 6 volt) starts out with a higher resistance. Some manufactures list the internal resistance along with the other battery data. I am looking at the spec sheet for Optima Batteries: a 12 volt battery with 800 CCA has an internal resistance of 0.0030 ohms which compares to their 6 volt battery with 800 CCA with an internal resistance of 0.0019 ohms.
Since the effect is rather small (0.0030 versus 0.0038) a pair of the 6 volt batterys could be an option if the price is right.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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