Battery OEM KIA or OEM Mercedes

This just happened to me last month on my 2017 C43 on the OEM battery. I guess five years is typical on these newer MB.

the only time it failed me was when the battery died after 100k miles.

When you say, \u201ctwo new batteries\u201d are you speaking of the big ones? There is a small one that operate your convenience/comfort items. It looks like a small garage door battery.

Learned that the battery in the Sorento was incorrect. Replaced with correct battery. All is right in the world.

Well it's 30 months old and is still 6 months under the pro-rated warranty. Took it to a dealer, they replaced it and said it would be 226 dollars! I asked if they checked the warranty and the technician stepped away and came back 20 minutes later. "kia corporate declined the warranty on your battery".