Updated to KK on 4/25. Almost immediately, battery meter started heading to zero by mid-day every day. So i got used to charging while at my desk, driving in the car, pretty much tethered to power whenever sitting down. Also, my OEM charger, provided with the phone, now always connects with a warning that if i want to charge at full speed, i should use the original charger. Duh. About a week ago, the hot battery message started to come up, and once it's on for the day, it doesn't seem to go away, even persisting after a restart. Sometimes it *does* feel pretty hot, sometimes it is clearly cool, but the message remains on for an extended period. Verizon. At about the time these problems started to happen, i discovered Samsung WatchOn app, and started to use it, then discovered Peel's Smart Remote, which is even better, but they both are always on, and i thought maybe they were the problem, but after uninstalling Smart Remote, and pretty much disabling all WatchOn features so it never runs, i've decided it really is KitKat that's the culprit. A fix would be really nice but i'd bet dollars to donuts that any update will come with additional baggage that will result in no overall improvement. I do see recommendations elsewhere, as mentioned by TaiMai, that you should reformat your SD card, as error retries and other SD memory management tasks can add compute time to your processor, which would result in heat...