I just replaced the original battery at 48,000 miles, 50 months, since new purchase. Noticed slow cranking 2 days ago, and on the return trip after about 90 mins parking the starter barely turned over and the engine just about fired up thankfully. Drove the 12 miles home with no problems. Checked voltage with engine running, was 14+ meaning alternator was OK. Shut down engine and voltage rapidly dropped to 10.5. Disconnected (-) cable and put in on charger for a few hours. Back up to 12.8. Left it disconnected overnight, dropped back down to 10.4. Not holding charge, time for new one. Started right up, no problems so far with electronic systems. All radio presets and phone call history were somehow saved, which I didn't expect. In-dash clock did go to 1:00. I have changed batteries on many vehicles over the years and all of them lost the radio and clock settings. Four years is reasonable for a battery especially in this hot climate.
The only trouble I have had with this vehicle is with the Kumho tires. I have had tread separation on two of them. The first was at 28,000 and 25 months while on a vacation road trip. Took it in to a KIA dealer in Colorado. They replaced it with a Pirelli and I was able to get a 100% refund of the Kumho price from Kumho (which was less than the cost of the Pirelli.) The 2nd was at 45,000 miles. This was replaced at Discount Tire with the same model Kumho, with some credit for remaining tread life, but I was not able to get anything from Kumho this time.
I am not sure if the other two original Kumho tires will do the same. I am planning to trade this in later this year for a newer model, so I hope I don't need to replace those tires before that.