Hi there,
If you are sure that the alternator is not to blame - I assume it is new or the copper coils are in good condition - then I would say it is the battery itself.
If you can, open up the cells using a large screwdriver. If the cells are dry or there is not much liquid in them, top them up with distilled water from an auto shop.
Take your Kia for a drive (5 miles or so) to charge up the battery and see what it is like the next day in the morning. If the problem still persists, then it is the alternator.
Hope this helps and vote for me if so. Cheers!
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