That's good, voltage will go up more slowly on a good battery. If charging voltage goes up quickly and slightly higher it is a pretty good sign that battery is not good. Set the clock, drive for a couple of days to make sure all is good with battery/charging system, check/clear codes and go from there.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)