If it turns out to be the battery, then I'd say you guys are doing pretty good. The OEM batteries in my 2015 and 2018 TLX's have not lasted more than 18 months. The hot Arizona climate has a lot to do with that. For me, the tell tale signs that the battery was weak was it wouldn't hold the seat memory position and on the 2018 also it would not consistently "auto-lock" the car when closing the door and walking away.
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2018 TLX 2.4L w/Tech, Bellanova White Pearl
Previously - 2015 TLX 2.4L w/Tech, Basque Red Pearl II