I know I'm an idiot for even suggesting this when it's obvious there is a capacitor in the existing circuit, but just try something to humor me:
Disconnect the capacitor and measure the output voltage of the charger on that fully charged 12V battery, and let me know what you get.
Lead acid chargers almost never have capacitive filtered outputs, the "R/C" of the battery averages the fullwave bridge or halfwave center taped output of the charger to what the battery sees as "full voltage" (be that 6, 12, or 24). I've seen and worked on battery chargers (bigger ones) that had capacitors, but they were in ferroresonant circuits, AKA constant voltage transformers. https://en.wikipedia.org/wiki/Voltage_regulator#Constant-voltage_transformer
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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