Since the update of my Xperia Z1 to Lollipop (5.0.2), my battery life is horrible! It takes a very long time to charge it to 100%, and I can only use my phone for a few hours.
How can I fix it ?
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Check the Battery usage under Power Management in Settings. There you see list of apps showing how much power they have consumed up to then. Check which app is using more battery and uninstall it. If the app is a System app (like Android OS, Android SDK, etc) then you need to Factory Reset the phone to resolve such issues or if any H/W like Screen, WiFi, GPS, Radio etc are using much power then you may consider complaining about the issue in any service center.