Why is my S4 battery draining so quickly?

[AC Question]

why is my S4 battery draining so quickly?

I have a 1yr old Samsung galaxy S4. I rarely use it during the day, since I'm in school. I always shut my phone off at night so it's at 98% usually and yesterday I ended up with 40% by 3:00!! How could that be possible?

 

[B. Diddy]

Welcome to Android Central! There can be a number of reasons, including poor signal, a rogue app that's misbehaving, automatic app updates, etc.

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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