It's not the original battery; but the original was changed due to me being a bit less smart about these issues at that time. I replaced it with a Kirkland battery, and going back to it again due to the warranty.

From what I researched; it could be anywhere from poor QC from battery manufacturer, to alternator overcharging. The battery didn't look swelled so I don't think it's the alternator...

I have maintenance scheduled on the car two weeks from now so I'll definitely mention this issue though!

thanks for the advice dukes

Let us know the outcome. Curious as to what the outcome is.