Why is my phone not switch oning but battery is in good condition

@akhila52097 you may want to rephrase this question. If your phone does not turn on, how do you see the battery percentage? What have you checked? Did anything happen to this phone? did it get dropped or water damaged? Did this just all of a sudden start by itself?

How do you know the battery is is good condition. If this is the original battery it is somewhere in the range of 6 years old. Time to replace it. It may tell you it is charge but it bmay break down under a load. So the first thing to do what be to change the battery. Since iFixit does not yet have guides for this phone, you want to go ahead and use this guide for that

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.

Repair is War on Entropy!

baterry problem

Charger problem