But Walt, dont forget, two six volt batteries in series DOES NOT ADD ANYMORE CRANKING AMPERAGE THEN EITHER OF THE BATTERIES ACTING ALONE. i.e. If one battery has say a 500 CCA rating, two of them in series still only has 500 CCA. In series the voltage is additive butttttttttttttt the current is NOT additive.
HOWEVER for two batteries in paralell, the voltage stays the same buttttttttt the current is indeed additive. If theres two 1000 CCA 12 volt batteries in paralell, theres theoretically 2 x 1000 or 2000 CCA avaialble for starting wooooo hooooo
A battery is an electrochemical energy storage device and for a conventional flodded lead acid battery basically the more lead n acid n plates (corresponds to more weight) you have the more energy that can be stored. Sooooooooo two sixes in series adds the voltage to 12 volts and theres indeed twice as much stored energy versus only one battery, buttttttttt the amperage that can be supplied is still only that which one of the batterys alone buttttttttt with two batteries you can supply it for say twice the time.
The thing is back in the thirties n forties n later batteries werent quite the same as today so they went with the twin 6 volt series arrangement in many applications, where today with a high rated 12 volt battery available thats the preferred system.
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