I'll show you 3 Solution to "Battery drains faster after Android 4.4.update."
1 Stop Automatic Syncing(KitKat 4.4.2)
Navigate to menu>settings>accounts
2 Disable Google Auto-Voice Detection(KitKat 4.4.2)
3 Battery Saver Apps to solve battery drain KikKat
Download One of these apps. These are the best and the most voted Battery Saver app to extend your battery life. Most effective with the Moto X, Nexus,4,5,7 and Samsung Galaxy's
A,Easy Battery SaverB ,DU Battery Saver & Widgets, These are all Special Tips to Preserve you battery life with the new Andriod Kikkat 4.4.2