(Fast charge happens between 20% and 80% battery capacity. Generally charge to 80% and try not to discharge below 20% battery capacity.)
Looking from a battery longevity perspective, does it basically say that you have effectively 60% of your battery to use without potentially causing any negative change in the battery state of health? Or, Maybe only limit a DC fast charge to 80% ? This would totally change my thoughts on which battery to purchase on my Aptera.