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It's called "charge voltage," because when the charging-voltage is the same as the battery-voltage, all charging basically stops.
Think of the "charge-voltage" as the voltage difference required (varies with battery composition AND temperature) to "force" electrons into an almost -- but not actually -- charged battery.
With lead-acid batteries the "charge voltage" is about 2.1-2.5Vdc for a 12.6Vdc battery...or 14.7-15.1Vdc output from the charger.
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