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Charge voltage is different from battery voltage.
If the charging system is operating correctly, the charge voltage will vary depending on the electrical load and the battery state of charge, 12V up to about 14.5 V.
If a charger is connected to a battery for a few days and the battery voltage remains below 12V or so, the battery is borderline. Take it to a parts store for a load test. There are modern bat. testers that can even test a discharged battery for load capacity.
Best wishes.
Sherwood
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