dmiller: You wouldn't have messed anything up, you can either charge them as two 6 volt batteries or as one 12 volt in series. Charging as two 6 volt may have told you something that you couldn't learn had you charged it in series. Did one battery require a lot more charging than the other? You could have a defective battery, (the one that took substancially more charge) and it will eventually take the good battery down. If you caught it in time, you might stress test the poorer battery, if bad enough, replace it.
There is also the argument on two battery systems, that one should always replace both at same time. I will say this, I've had good results changing one battery in a two-six, series system, however not in a two-twelve parallel system.
If you found they took roughly same charging, you may as well keep using them as long as you can tolerate them.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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