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At 100% State of Charge the open circuit voltage of a 12Volt battery is around 12.7 to 13 Volts depending on Battery chemistry/type (Liquid v Gel v AGM type). Sometimes immediately after charging a battery will read in excess of this, but this "surface charge" as it is known is not considerable and "burnt-off" by internal resistance after a rest or even short duration under load, as is the usually recommended practice before measuring battery open circuit voltage. It is not considered significant enough by to be considered as part of the charge capacity of the battery.
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