Apple was forced to add user-facing battery health functionality in iOS 11.3 for its iPhones after it was found throttling performance on devices with “well worn” batteries. This battery management feature now allows you to see what percentage of your max capacity is available, and if your performance is currently being crippled due to an

Source: Hot Hardware – Apple’s macOS Catalina‌ 10.15.5 To Add Functionality To Prolong MacBook Battery Lifespan