I have a 2015 Subaru Outback, on April 8 when I went to pick up friend at airport the battery died.

I had the same issue 2015 outback - after replacing the battery twice in 4 months I found that there is a subaru TSB released 2017 which involves reprogramming the computer logic to address a condition where the ECU is not sufficiently charging the battery when you drive below 10miles (they call it short trips) which in my opinion is ridiculous but after dealer updated the software the battery charges properly and stays between 12.5-12.7 volts. Google TSB 11-174-17R. There were couple other people at the dilership with the same issue 2107 Outback and newer WRX. it is not a warranty item but if you do you homework they may agree to do it for free (otherwise it is around $130) - in my opinion this is 100% buggy software which Subaru should repair/update for free. Good luck.

GuruWT862, Do you still after nearly 4 years have this issue again? I bought a new 2015 and got a new battery in May 2020, I guess that was fair due to cold climate and it now being 5 yrs old, then early Feb 2022, battery died, so previous battery was only 21 months old. Replaced it on Feb 9, 2022, and it died again on Feb 26, 2022. Read about "CAN System Parasitic Drain on the Battery" issue. I bought a new 2022 and got it two months ago and gave this "sick" Outback to my daughter, who has had this issue and hate to think she is on a remote college campus with little cell service and dead in the water. She has now inherited the 2022 Outback and I have taken the "sick" 2015 back in my hands. Now wondering when I take it to the dealership they are going to do diagnostics and say, "nothing is wrong, charge me tons of money", say I need yet again a new battery, ignore me saying, "I know there is a Subaru-wide issue that you have known about since 2014 and leave me reeling with anger. Thank you! Sorry for the rant.