The calculated discharge curve method is based on thermodynamically reversible work: the product of the open-circuit voltage, initial current, and time, i.e., the sum of useful energy and energy losses. A calculated discharge curve is based on the constant step change of the battery voltage in correspondence with a cardinal number set. The essential solution is the transformation of the discharge data: voltage vs. time into time vs. voltage, using Basic Equation (three-point operators: power of internal resistance and time), which are valid for all battery electrochemical systems, battery...