Great update with the latest release to increase battery life!
But I still have problem because my computer is connected to the charger constantly but is still charged to 100%. Is there a possibility to force a maximum state of charge to 80%?
You do not have to micro-manage the battery or charge state.
macOS Catalina 10.15.5 introduces battery health management, a feature designed to improve the lifespan of your Mac notebook's battery.
The Battery Health button appears in >SystemPreferences>Energy Saver —this feature is limited to Mac laptops with Thunderbolt 3 ports. That equates to all MacBook Pro models released since late 2016 and the Retina-capable MacBook Air models released since 2018.
With the release of macOS 11.0.1 Big Sur see >System Preferences>Battery
About battery health management in Mac notebooks https://support.apple.com/en-us/HT211094
No, and there is no need as long as you enable battery health management, then your Mac will take care of itself.
About battery health management in Mac notebooks - Apple Support
Set maximum state of charge on macbook pro
