Battery OEM Mazda or OEM Hyundai

My I6 battery died after 4mo and 2200km (1370mi). Car is sitting at the dealership awaiting warranty decision.

I went to an official dealership and they told me the battery is faulty, and replacing it would cost around 185 euro, labor included. I checked online and it seemed like in the Netherlands a comparable battery costs between 85 and 120 euro.

So far have not had any issues except for dud OEM battery, kriginal and warranty...