I noticed since our last cold spell (-25C for a couple of weeks) that I was getting all the low battery symptoms (door handle unlock only working on the drivers door, no Auto Stop/Start ever, etc.) even though the weather warmed up to 0C again. Given it's a 2018 I figured it's time for a new battery. But, I put my Nautilus charger on it overnight anyway. In the morning, the charger indicated "LO" meaning it hadn't been able to get the battery up over 50%!
But, driving it the last week it appears the "smart charger" must have run a recondition overnight or something because everything is working great! I'll have to check the voltage and see what the resting value is to be sure. Maybe some of these batteries are just getting a bit sulfated or something?
Who knows, it might start acting up again in a few weeks and then I'll be buying that new battery anyway...