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My battery issue with a 2016 Subaru outback 3.6 (draining in two days) was rectified by Subaru by having the dealer reprogram the ECM and/or the BCM. I have kept track of the voltages since they serviced it from 5/7/2020 to 6/27/2020 and it has never gone below 12.09 volts. After sitting for four days, the voltage was still 12.26. If you have this problem, call the national hot line. Great response! David Beebe
 

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The battery should last a solid three weeks when the car is parked. Also, measuring voltage alone is inconclusive as to battery health. You need to measure it under load with a load tester. It is highly recommended to upgrade to a group 24 or 34 battery (from group 25.) You will close to double your CCA.
 

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2016 Outback Premium 2.5 CVT w/EyeSight+SRVD
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You will close to double your CCA.
So what? CA/CCA aren't reported problems with the OE batteries, battery capacity (RC and AH) are. In particular, CCA only applies to starting performance at 0 degrees F with a fully charged battery.

... measuring voltage alone is inconclusive as to battery health.
True, but it's a good place to start. Quiescent voltage is a good indicator of a battery's state of charge, and it may also reveal shorted cells. A load test is used to determine if a battery can deliver adequate power under high-current (e.g. starting) conditions.
 
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