Re: 2 x 6V in series or 2 x 12V in parallel?

Posted by Hal on September 10, 2002 at 17:49:27 from (24.188.49.98):

In Reply to: 2 x 6V in series or 2 x 12V in parallel? posted by Chuck in Wisconsin on September 10, 2002 at 06:46:52:

I have had good luck with the two 6 volt batteries in series. If you think about it, you are actually constructing a 12 volt battery when you put the two in series. If one of the batteries in a series connection goes bad, it will not discharge or damage the remaining good battery, you will just notice a weak or dead battery symptom, much like a dead cell in a single battery. You could just replace the one bad battery and be ready to go. On the other hand, with batteries in parallel, if one goes bad, especially if it shorts, it will ruin the other battery. The reason the diesel called for two batteries was because it required more cranking capacity and to run the intake heater. Yes, you can draw a lot of amps from newer 12 volt batteries, but they will not crank for as long a time as two 6v in series of the same physical size. A 12 volt battery has to cram more cells and internal connections into the same physical space. My preference would be to either try the largest best 12 volt battery that will fit(single) or go with the two 6 volts in series.

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