Battery Health

Battery Health is a feature introduced in iOS 11.3 for iPhone 6 and later models. It allows users to monitor their device's battery status and reduce power usage to prevent unexpected shutdowns due to insufficient voltage from depleted chemicals in aging batteries. A similar feature appeared in macOS 10.15.5 "Catalina" for MacBook and MacBook Pro models. iPads only track usage and require a separate utility to be diagnose battery health.

History
Apple had quietly introduced this as an internal feature in prior versions of iOS without notifiying users or providing controls, leading to a class action lawsuit for "" the performance of iPhones with aging batteries. This resulted in a legal settlement in which Apple offered discounted battery replacement for 29 throughout 2018.