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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