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 Day Tractor Lovers Dream About - by Angus Crawford. The day started at five o'clock on the morning of Friday, the January 29, 1999. My father, my sister, my uncle, my cousin and myself all climbed into my uncle's Toyota van. It was six thirty in the morning and we had a long day ahead. We traveled for six and a half hours to our destination - a little country town with a population of no more then one hundred and fifty people (57 of them being children under the age of thirteen). We arrived hoping to meet up with a man we knew had over one
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