Phone keeps losing 50% battery life overnight

[Geodude074]

This keeps happening every night when I don't charge my Nokia Lumia 520 overnight.

Any fixes for this, other than to keep it charged at all times?

 

[rockstarzzz]

Remove this app. Turn on battery saver. You are good to go.

 

[PxuLL]

This also happens to my L820 whenever I use it for watching YT Vids then switch it off the battery continuously runs down atleast 30% its really frustrating.

 

[PxuLL]

Remove this app. Turn on battery saver. You are good to go.

My batt saver is on 24/7 when batt is low but not useful, do not want it on anytime.