About battery and performance - Apple Support

Learn about the battery and performance of iPhone 11 models and later.

Save keystrokes with text replacements on iPhone - Apple Support

How to Disable Apple's Performance Management Features in Older iPhones in the iOS 11.3 Beta - MacRumors

Share analytics, diagnostics, and usage information with Apple - Apple Support

How to Tell if You Need a New iPhone Battery

If you see Service Recommended on your MacBook Air or MacBook Pro - Apple Support

iOS 14.5 Will Recalibrate the iPhone 11 Battery Health Reporting System

How to Tell if You Need a New iPhone Battery

iPhone Battery Health: What You Need to Know

Apple support page discusses iPhone performance management, throttling options in iOS 11.3

Use Continuity to work across Apple devices - Apple Support

Apple says the iPhone 15's battery got better — but won't say how - The Verge