In the iOS 26 release notes, Apple is warning iPhone users that installing the new software might have a temporary impact on battery life, which is normal.

iOS 26 Battery Glass Feature
A new support document explains that major iOS updates require background setup like indexing data and files for search, downloading new assets, and updating apps.

Further, Apple says that new features could require more resources, leading to a “small impact” on performance and battery life.

Apple’s hardware and software are designed together to…