I had a 2017 and never had issues with the battery.

It’s actually super solid in the 2017 I noticed not having it with my Sonata and I miss it.

Mine did this for my last cars brakes, I took them to my mechanic and he said they had 2 years left on them. The dealership tried to get me to trade my 2017 Mazda3 Grand Touring in for a 2021 CX-5 with 51k miles when I said no they found all of these issues they said my serpentine belt was cracked at 36k miles and there was oil buildup on another belt (this one was true) as well as a handful of other issues every single one except the oil buildup was a lie or exaggerated. Never trust a dealership beyond warranty work or recalls.