Hey all. Trying to diagnose a battery/charging issue.

When I run test 9, it is showing 11.6.volts or so (I know that is low) just wondering if my issue is just the battery or is caused by a bad alternator.

When running the vehicle the volts sit at 13.5-13.7 (pretty much 13.7 most of the time). I thought it should sit between 14.2-14.7volts, however I watched some videos of people replacing their alternators and it brought their volts to 13.5ish...

Thanks for the help.

(Battery is about 5years old...I realize I need a new one, but I don't want to put a new battery into a bad alternator)

Merry Christmas (I am thankful for automotive forums)

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Jake

2020 Toyota Supra
2015 X5M
1999 LX470

Past:
2007 335i, Jb4, dps, meth
2007 650i
2001 X5 4.4 (non-nav)
2000 AM General H1
2008 BMW 650i
2000 Honda S2000
1998 Lexus LX 450 fully locked