I have a battery problem with Sony Xperia Z3 past two weeks. I am not sure why?

[AC Question]

Until two weeks back battery lasts for at least 30 hours, but now hardly lasts for 8 hours. Apps and its usage is still same nothing has been changed.

 

[B. Diddy]

Welcome to Android Central! Charge up to 100%, then let it drain to 20-30% with normal usage, without charging in between. Then show us:

1. The main Settings>Battery screen.
2. The fullscreen battery graph screen (which shows Awake time and Cell Signal Strength).
3. The Screen category (to see total Screen On time).
4. The Cell Standby category, if present (to see Time Without Signal).

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