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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