for smaller appartments, it's pointless to charge liion battery to 100% as when e.g. 30% of the battery is generally depleted per one cleaning cycle, there is no need to charge to full.
Point is - above about 80% of charge, every charging damages the battery significantly: Roborock, behave ecologically and add an option to charge to say 75 or 80% instead of 100%, or, even better, over time, learn what battery charge is really useful and try to keep charge/discharge between healthy say 35-75 percent of total capacity. I am sure there are many appartments that would benefit from much prolonged battery longevity due to this optimal charge/discharge voltage level range, and less wasted batteries means less polluted environment and happier customers!
Our android tablet has exactly this feature and its purpose is just this, to extend the usable battery life.
Thanks for considering.