Battery backup is not working good

@sumitsingh46731 none of this "Front camera got blur My whole screen get cracked" ha anying to do with your battery. You will need to replace the display as well as the camera module. Then recheck the battery. It is possible that you have gotten a "low quality" replacement or that the battery has not yet been properly "calibrated". Something like this:

• Charge till 100% full
• Let it trickle after that for 30 minutes (means leave it connected to charger after it reaches 100%).
• Then use it without charging until almost 0%.
• Then charge it without interruption till 100% full

should work.

Also, make sure that your software settings are set-up for optimized charging and turn off all background applications that may drain your battery prematurely. To work on your phone and since iFixit doesn't yet have a specific guide for this, use something like this video to work on it.

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 issues with their device. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!