Want to check your iPhone's battery health? Apple landed in hot water with customers a few years ago when a feature designed to slow the processors of older iPhone models to keep them from suddenly shutting down came to light. Critics maintained that Apple was throttling the speed of earlier iPhone models to push customers toward newer devices, while Apple insisted that the feature was necessary to cope with aging batteries. Now, Apple lets iPhone users monitor their battery life. You can also enable a feature that reduces aging by optimizing how your battery behaves when charging. Let's get started with how to check your iPhone's battery health. It's quick and easy, and a valuable piece of information about your device.