Battery keeps draining on 2020 Legacy Premium

[PamInBmore]

My mother-in-law has a 2020 Legacy Premium she bought new in 2021 from a dealer in NC. During the first year she had the car, the battery died a few times after the car sat in the garage over the winter during the pandemic. After having the car checked and rechecked by the dealer, they finally replaced the battery saying the original one was defective. In Dec 2022, mom relocated to MD to be near family. Now almost a year later the battery has died again at least 3x. It is to the point she has purchased a portable jump starter so she doesn’t get stranded somewhere. The car gets driven about once per week for errands. Anyone else having a battery or electrical system problem?

 

[LFR1776]

If it sat much with cold temps it could do damage, but I would charge it and take to a auto parts place. They test them for free. Could have a drain for a phone charger or something thats slow, but will kill it in time.