What was their recommendation?
Our August 2016 built Forester (non-turbo limited) will need another battery soon, can't leave the domelight on for more than 2hrs. I'm not sure where SOJ sourced their battery but the one we got is sure as heck worst than Autozone or Walmart batteries, and I bought and warranty/prorated a lot of batteries over the decades.Subaru really ought to upgrade the batteries they put in their vehicles. It's difficult for Ambassadors to keep a straight face when consumers ask them how long the batteries last on Subarus.
I looked at three or four pre-owned 2017-2018 Outbacks before I purchased one, and they ALL had battery corrosion that had seeped onto the mounting bracket. Both of our WRX's (2015 and 2016) required replacement batteries within 18 months of being purchased new off the lot.
I believe that the vehicle self tests are draining the battery. Often I walk past my car in the driveway and I hear whirring from the rear or the front. I know that these are part of the car's systems checks but I've never heard it this often before from any of my other cars. If your setting for auto update is on, then that means the car os actively using wifi and pinging the software server at regular intervals to check. Given that the stock battery is possibly already weak, these two functions alone will kill your battery power,
What device or where to check battery volt ? USB in Car Cigarette, Multi-meter...etc ?