Applications of the theory of strict monotonous asymptotic energetic stability developed in the first part require determination of the system power and energy and tests of their properties. The bond graph modelling appears an adequate effective approach to solving these problems. This is shown in this paper and illustrated by an example of strict monotonous asymptotic energetic stability of a nominal level of a flow-through tank, which is carried out by applying the bond graph theory. The main result is the theorem on the general relationship among the Eulerian derivative of the total energy of the system, the supplied power to the system and the power supplied in heat dissipative elements.