[washadjeffmad]

There are apps that can limit the charge %, or using something like Tasker to cycle a smart plug.

Android 16 also has native limiting under Settings > Battery > Battery Health > Charging Optimization > Limit to 80%

[nubinetwork]

My phone seems happy with the 80% setting, but my laptop went through 3 batteries before I decided to rip it out and only run the thing off the wall wart.