Adaptive Charging is a new ChromeOS power management feature available on some devices. Devices with Adaptive Charging enabled via Settings, charge to 80% and then complete charging to 100% based on an ML model’s prediction for when the user will unplug their device. Reducing the time a device spends at 100% charge helps preserve the battery's health and ability to hold a charge over the lifetime of the device.

To enable adaptive charging: Settings > Device > Power

If you do not see the feature toggle appear in Settings, it is not yet available on your system.