I charge both my EV6 and Sportage PHEV to 100 every day. The 80% rule came about when EV's were new and you could harm the battery. With today's BMS's and the buffers built in (100% is not 100%, 0% is not 0%) you won't hurt it. Even my EV6 manual says nothing about what percent to charge except to say to charge it to 100% at LEAST once a month. If anything above 80 would hurt the battery, Kia would have it written everywhere in the owners manual because it would cost them a ton to replace everybody's batteries with the 10 year warranty on it.
