The SOC (state of charge) indicators which are the long bars will range from 12 bars at full charge to 0 bars when fully discharged regardless of the number of capacity bars (short bars). The 80% charge option only works through the charge timer of the navigation screen. It will stop charging at either 9 or 10 SOC bars (long bars). With 8 capacity bars showing (2 red and 6 white for total of 8 showing and 4 missing) the car probably has a full-charge range of about 50 miles combined city/highway with A/C use (less if tires have higher rolling resistance than originals). I made my 52-mile round trip mostly freeway commute with normal A/C use in the summer when the 2011 was down to 8 capacity bars before Nissan replaced the battery, but I had essentially no reserve and would not have been able to make it during colder winter temperatures. I started each day at full charge and was into VLBW (very low battery warning) when I arrived home.
I am not going to tell you whether to keep the car or return it. Prices on used LEAFs vary greatly depending upon vehicle condition, battery condition, and location.