Yes you can purchase from Auto Zone and have them install it. Won't do anything to your warranty.
I had bought a 2015 used in 2016, which already had over 30,000 miles on it so I paid for an extended warranty So it depends contact where you bought and see when it runs out, and go from there. Good luck.
No but check batterys have a 36 month warrenty from kia if you bought it new
It shouldn't but it is always better to check with a call to the Warranty company
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