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I had similar battery drain issues.
Resolution should be as follows:
1.) Go into settings > location and then set location mode to battery saving instead of high accuracy. Kitkat uses more location services, so putting in battery saving mode will help a lot.
2.) Open up Google Now - swipe up from home button. When in Google Now, click on menu settings and then Voice and then "OK Google" hotword detection - turn off this feature as it is constantly trying to listen for the hotword and the processor architecture of this phone is not as efficient as others that are designed specifically for this. This will also help save battery.
After implementing both of these changes, I recharged the phone to 100% and have been monitoring battery and it has improved significantly. My battery meter directly within Android system settings is currently showing 66h and 12 min remaining with ~90% of battery remaining.
Hope this helps as it did for me.
