A true deep-cycle battery is supposed to be charged at a higher voltage then a cranking battery. 15 volts normal charging and 16 volts to "equalize." That's why deep-cycle batteries never get fully charged when hooked to standard automotive alternators.
12.3 volts is a battery with only 70% charge - IF your voltmeter is correct.
You stated it's a 12 volt battery which makes me think it is NOT a true deep cycle - but more of a quasi dual-purpose battery. But, I could be wrong. What brand and what part # batteries are they?
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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