The latest Android 15 update introduces a new feature designed to help your Pixel phone's battery last longer, called 'Limit to 80%'.
This feature stops the phone from charging beyond 80% because fully charging a battery can wear it down over time.
In the Settings > Battery menu, you can choose between 'Adaptive Charging', which charges to 100% before you usually unplug, or 'Limit to 80%', which stops charging at 80%.
This update is still in beta testing, but it's expected to be released as part of the Android 15 QPR1 update in December.