two 6v in series the total cca doesn't increase. It's the same as one 6v. Only the voltage increases to 12v.
Two 12v in parallel, the voltage stays the same, the cca of each battery adds together making cca double.
It's possible a huge 6v battery may have more plates and be able to produce more cca than a 12v battery. I think that's why old golf carts used six 6 v batteries in series instead of three 12v batteries.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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