iOS 27 has started rolling out , bringing Siri AI, expanded Apple Intelligence, AI photo editing, and more customization options for Liquid Glass. Early reactions have been largely positive, but as with every major iOS release, some users are noticing their battery draining faster and their phone running warmer than usual in the days right after updating. According to Apple's own support documentation , that's expected, not a sign anything's wrong. Immediately after a major software update, a device needs time to finish setting itself up in the background. That usually entails indexing files and data so that system-wide search works properly, downloading additional assets for new features, and updating apps to their latest versions. SEE ALSO: Apple iOS 27 is here: When you can download it (updated) All that background activity draws extra power and generates extra heat, which is why "battery life and thermal p...