https://wccftech.com/ios-13-beta-optimized-battery-charging/

A new feature in iOS 13 beta called ‘Optimized Battery Charging’ aims to keep your Battery Health in check and hopefully prolong it.

Batteries have a certain age after which they just stop functioning at their full capacity. This means that your phone or tablet won’t stay awake for long as it used to on day one and if you have an iPhone then you will suffer performance degradation too in order to make up for the lost battery health. Apple even added the Battery Health feature in iOS so you can have a clear look at where you stand in terms of ‘battery damage’ over time. With iOS 13, Apple is taking things up a notch with a new feature called Optimized Battery Charging.