I am buying new iPhone 13 in date of 14 October 2023 And I was shocking of battery health, he was badly drain maximum capacity 92 and last 2-3 days battery health is regularly 2-3days before one by one percentage drain and my iPhone is under warranty, so I change the battery
Please support
iPhone 13, iOS 17
Battery health drop is normal and nothing to be worried about.
Dropping in battery health is caused by normal chemical processes in the battery. This is nothing to be worried about and apple will not replace your battery if you’re battery health is above 80%
See this user tip that I have written about this subject for further reference
About battery health on your iPhone - Apple Community
Battery drain Issue
