NHTSA Complaint #11439910 — 2017 SUBARU OUTBACK

My battery is constantly dying. I upgraded the battery to a much larger one yet it keeps dying. If the car sits for more than three days it dies. If the car is driven for a very long time then it will stay working for about three days, then die. Today it is dead. It was dead yesterday. I jumped it yesterday, drove it around, restarted it to make sure, drove it around some more and then parked it. Today it is dead. The battery voltage is fine (a bit low, perhaps) at 12.8V, when charging at 14V. If I jump the car in my driveway, run it for a while, it essentially does not charge the battery. It is almost like the car is designed not to actually charge the battery unless you drive it a lot, which seems counter-intuitive. Engine RPMs doesn't seem to affect the charging ability even though it should. I have one after-market device installed: a remote car starter, built and installed by Subaru. Otherwise, this is a stock, 2017 Subaru Outback. All interior lights are switched off, the head lights are left in the Off position, yet the car continually dies. When I do drive it on a daily basis, it usually is fine. However, I did have it die one time while doing a bunch of errands. Basically, drive 10 minutes, stop, run the errand, drive 10 minutes, stop, run the errand, etc. After the fourth or fifth errand the car was dead. As this is a continual problem I have a lithium power pack designed to jump the car, so that provided the rescue I needed. But I should not need this type of rescue!