Car is 2006 X5 3.0i with 136K. Original Valeo alternator.
For the last 6 yrs...doing Test #9...

- Engine idle at 700Rpm, voltage = 13.9V
- Engine off in AM, voltage = 12.2V, even with brand-new battery.

I have heard that a battery at rest, as long as > 12.1V, it is OK?
Of all the cars I have owned in 25 yrs, I never get anything more than 12.4V, even with new battery...

Any ideas?
Is this voltage of 12.2-12 4V normal?

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT