Problem in battery it finished quickly

@abdellahamr make sure that all of your settings are geared toward power savings mode. Turn off any Apps that are running in the background. If none of that makes a difference, replace the battery and re-evaluate.

Since iFixit does not yet have a guide for this, use this one or even a video like this

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.