[bilbo1737]

Hi yall.
Under warranty, I have had to replace my car’s battery more than 4 times in a year and a half due to it dying overnight. I have had to jumpstart the car countless other times. Its a 2018 crosstrek. Lights are not being left on, nothing is left plugged in overnight, and I park in a garage (not in the cold).
They have replaced my amp (which was blown one of the times subaru replaced my battery), and are now replacing the TPMS sensory batteries (the light came on during the drive home from the dealership after they put on snow tires). They are now saying that this problem is due to the salt from the roads.
Has anyone had this issue with their car, and if so what was the root cause? And does anyone recommend a good subaru service site/technician in Massachusetts or Eastern NH?

I have a 2021 Crosstrek premium, and have had three battery replacements after 1 year and a half of use. Take it or leave it this is what I found out from an electronics technician. I had subscribed to starlink for emergencies. The starlink system automatically calls up to the satellite every 30 minutes to make sure there is a receiving station operable. This in turn burns up battery juice all night long, and if you put on extremely low mileage like I do since I live in the city, your battery is under a constant discharge. My remedy to my problem as follows: turned off all unnecessary lighting inside the cab, killed my subscription to starlink emergency services, put in a Sears die hard AGM platinum battery, and once a month use a smart charger to top the battery off to 100%. After one year with the new AGM battery I've had no problems by following that procedure. P.S the dealer and the AAA mechanic and a few others have told me I simply do not drive the car long enough per month, and all agreed including the Subaru technicians that the starlink system his problematic... Especially if you park your car in a concrete garage. The starling system will continually keep calling up to the satellite to try to establish a connection

 

[bilbo1737]

My bet is it's a DCM issue tied to Starlink. Take to dealer. Your car DCM may be covered by Subaru extended warranty for this issue. My 2019 Outback had sever battery drain issue and it was repaired at no cost. The name for the battery drain is called "DCM parasitic" drain. Google for full details.

 

[bilbo1737]

Yes the DCM parasitic drain is a problem and there was a service bulletin put out on it. I believe I was a victim of that problem. And I am also putting on way too little mileage for the alternator to even attempt to keep my battery up to snuff.... There are no other battery drains detected. So as stated earlier I just removed all the unnecessary lighting inside the cab which is useless to begin with, discontinued my service with serious FM and killed my subscription to starlink emergency services... Put in the die hard AGM Platinum, and then top off the charge once a month or maybe once every month and a half... This works for me it's not that big of an inconvenience