The battery on our Kia venga 1.6 Auto 2017 (not stop start) has failed at 26 months. The battery is a flooded cell type but for some reason has a AGM sticker on it.The dealer will not replace as 2 months out of guarantee. I have replaced it with a better and bigger battery AGM type ,Will this cause any issues with the car charging system or overcharge the AGM type. Any thoughts as to why it was stickered ??.