Battery Voltage When Installed vs When Not Installed

[LoneRNGR]

I am trying to diagnose a problem with my battery or charging system. Using a multi-meter, when connected my battery measures 12.1 volts and when disconnected it slowly rises to 12.5 volts. I am thinking that a fully charged AGM battery should be 12.7 volts when not under load. Can anyone let me know if you have similar voltages on your battery?

Edit: I guess that I should add that this is an XLT since the Lariat has a different size battery.

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[LoneRNGR]

It appears that the BCM / BMS was not working correctly. I think that I may have it cleared (reset) but I'm not certain. I'll report tomorrow. In the meantime does anyone have a confirmed method of resetting the Body Control Module (BCM) without a scan tool or leaving the battery disconnected for 8 hours?