What did you end up doing about your battery? I'm in a similar situation with my late build '18 with just under 20k miles. I first noticed my passenger side intelligent access wasn't working then recently noticed my interior lights don't stay on very long. No cranking issues yet but I have topped the battery off with my battery maintainer twice but the symptoms have returned within a couple days, both times.
Which battery did you go with and why? Did you have to reset your battery management system?
Thanks!
Ill repost my experience and BMS info
Need a load tester or stop at a PepBoys, autozone, what have you in your area for a free battery check.
I checked mine early this fall after 4 years and 60k ish and it was not well, I changed it out. $200 is cheap insurance compared to the dead battery inconvenience 30 miles from the nearest parts store in the OBX or in a 10F morning in NJ. FTS.
And don't forget there is a BMS if you replace the battery yourself. I assume you can use Forscan if you have that, I don't, others may know.
From the 2018 OM on BMS reset.
After battery replacement, or in some
cases after charging the battery with an
external charger, the battery management
system requires eight hours of vehicle sleep
time to relearn the battery state of charge.
During this time your vehicle must remain
fully locked with the ignition switched off.
Note: Prior to relearning the battery state
of charge, the battery management system
may temporarily disable some electrical
systems.
