Hello,
almost all mobile products (except Apple), support a limit for the charger to 80% or 85%, so that the battery stays within a healthy range to increase the overall battery life.
I didnt read from such a feature for Garmin-products, but I would like to keep my new 7X Pro as long as possible and therefore maximize the battery lifetime. And keeping an eye out when it hits 80% is quite cumbersome over the long run.