User level: Level 1 (4 points)The last update to 27.0.1 on my iPhone 16e is causing quick battery drain that was not occurring before the update.
Posted on Oct 29, 2026 5:44 PM
User level: Level 10 (244,490 points)Oct 29, 2026 5:55 PM in response to miss mississippi
After the update iOS has a lot of work to do, rebuilding data structures, and especially the search database. During this process the iPhone will use additional power for several days:
From If the battery in your iPhone or iPad drains too quickly - Apple Support:
If you notice that your battery life has decreased after updating your device, wait a few days and then check again.
Even though you can use your device immediately after an update, certain tasks related to the update continue in the background and might affect battery life and thermal performance. While they're ongoing, if you open Settings and tap Battery, you might see the Insight Ongoing iOS Update.
Originally posted at discussions.apple.com/thread/256385617