Apple is adding a new feature into MacOS Catalina 10.15.5 called Battery Health Management, Apple said through blog post.
With the new feature, the battery’s lifespan will improve by reducing the rate at which it chemically ages. The feature does this by monitoring your battery’s temperature history and it’s charging patterns.
The idea here is most users leave their laptops plugged in for charge even if battery is at 100%. With this feature, there will be a limit in charging the battery to its full capacity. The feature will be on by default, but can be toggled off.
Based on the measurements that it collects, battery health management may reduce your battery’s maximum charge when in this mode. This happens as needed to ensure that your battery charges to a level that’s optimized for your usage—reducing wear on the battery, and slowing its chemical aging.support.apple.com
It is not completely a new thing in the market, ASUS has been doing this for a while as well.