Is it possible to determine the specific energy of a hybrid supercapacitor with a non-linear charging/discharging characteristics (see the attachement) from contant power discharge experiments? Such tests are widely used in industry but simple EDL capacitors are characterized by a linear U=f(t) profiles so it's possible to discharge them to 1/2U which corresponds to 3/4 of the total stored energy. How about the characteristics such as mine? I'm a little bit confused...