When I updated my HTC One to KitKat, I also experienced very poor battery life. Somewhere in the forums I read that a factory reset helped. It's a hassle to have to resetup a phone from scratch, but I chose to do the factory reset anyways. Glad I did. After the factory reset, and completely resetting up my phone I find my battery life is outstanding again. And no I have not taken any measures to preserve battery life. No dimming the screen, no turning off wifi, mobile data, gps. None of that nonsense. It really worked for me and was well worth the effort. I've been on battery 17 hours with light to moderate use and still have 53% battery left. Before reset I was only getting about 8 hours with light use. It's worth a try. Good luck.
Here's a screenshot
Sent from my HTC6500LVW using AC Forums mobile app
Here's a screenshot
Sent from my HTC6500LVW using AC Forums mobile app
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