DanD.

Hello all,
Im not the first owner and not sure of battery was replaced or not.
I was able to open plastic cover under passenger seat (saw videos where people cut carpet) removed air vent pipe and battery is right there. No stickers or obvious dates.
One one side is the barcode and only one stamp on the negative contact shows 43 13 which could be week and a year. Please see attached images.
Any idea when it was manufactured?
Thank you.