Simply put, the old 12s were not well matched. Manufacturing processes did not produce units similar enough to prevent problems. The real issue is internal impedance, ie the drain while sitting doing nothing. One battery was typically a small load for the other at all times when sitting. If used/charged very very often then no harm, but in days gone by batteries that sat didn't tolerate that very well. Acid batteries just do not like being below their quiescent threshold. Chemically it kills them fairly quickly.
I just use a single 12, as it produces more than the original pair of sixes and I don't have to deal with cold all that often. A pair of jumpers can fix the occasional shortcoming.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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