My iPhone 6s sometimes suddenly goes to 1 - 10% and sometimes 70 - 80% after restarting. Sometimes my iPhone works for 4 - 5 hours and sometimes 100% goes down to 10% in 1 hour or less. What is this problem? Is there a battery issue or issue with software? Should I go to some repairing shop or sell it?
I have seen so many question like this but non of them are giving a correct answer for my problem. I've never experienced this type of issue in my any phone but iPhone 6s is not working fine for me.
Here are few problems that I am facing:
Battery automatically goes down in few minutes.