I know many people claim better battery life after updating to 4.4, but I don't see it. I just updated about a week ago from 4.3 (MI7) to 4.4 (NF4) and battery life is similar at best, but mostly worse.Not only that, but charging also takes much longer. Normally my battery would fully charge in about 2.5 hours, but couple nights ago it took 5 hours to go from 10% to 82%. I went back to sleep and finally was fully charged after additional 3 hours, but then as soon as I turn it on, went down to 97%. I never seen that before. I run 0228 code and discharged to 0 and then back to 100%, so hopefully that will calibrate battery better, but still just last night phone was at 100% before sleep and in the morning down to 80%. Normally on 4.3 I would loose 3% to 4% overnight. I just hope it's temporary and will improve after settling down, otherwise i will need to run some serious diagnostics and fix it. Antutu also seem slower, last time I run it on 4.3 I got 37083, under 4.4 I barely got 35000.