Battery some problem

[agnet danyal]

My iPhone 6 battery drain overnight I don't know what problems 100% battery morning 0% reduced

 

[TripleOne]

Hmm... do you have it plugged in into a charger overnight?

I tend to keep my devices charged overnight.

 

[fabio984]

Do you have a Macbook? If yes, you can install the app CoconutBattery on it, and then plug the USB and it will tell you the atual battery life capacity, battery cycles, and others status.
I'm using Phone 5S, 1 year and a half old, and battery drains very fast.