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.

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