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Over 13v is a surface charge that will dissipate. Disconnected, it might stick around for a couple days or only a few minutes. When it's gone you should see something like 12.8v for a pretty new battery or 12.6 for one a couple years old.
The speed of the loss of the surface charge depends on the internal resistance of the battery.
You can also use a light bulb or hook up the car and open the door for a few seconds to dissipate the surface charge so you can see the real state of your battery. Which sounds fine.
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1987 928S4
1992 968 cabrio
2009 957 Cayenne GTS
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