What is the Voltage of a 12V battery after a Week Without Starting

Can a 12-volt battery lose voltage after not starting a car for a week? You bet it can!

12V Battery FAQ MachEforum - Ford Mustang Mach-E News, Owners, Discussions, Community

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Is this 12v battery fully charged 12.62v, and is the cheap Chinese wall-wart charger voltage 15.22v too high? Sealed lead-acid for electric start. 20deg F here then single digits. : r/OffGrid

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