New to the DJI "ecosystem".  The battery % displayed question.  % of useable safe capacity or total capacity of the battery?

Today, like most sessions are flying in cool conditions (5-10C).  Flight times are relatively short at ~12-13 minutes. I try landing with +30%  level to reduce the chance of overdischarging the battery.  Assuming that the ~30% is the actual remainin capacity.  Other quads are landed when voltage sag hits ~3.45v.  Capacity decrease with use. Somewhat less useful info for determining when one should land.  

You can fly most DJI batteries past 0% - Landing with a reasonable % is good for safety but as the batteries throw replacement warnings at 200 charges the health of the battery is less important than on other quads.