The actual discharge curve of a primary or secondary cell is a set of measurements: voltage vs. time, from which the cell/battery characteristics may be determined as well as the family of Calculated Discharge Curves. In addition to the experimental measured discharge curve, the cell relaxation curve is needed. A Calculated Discharge Curve Method (CDCM) was developed to improve discharge curve monitoring and cell characterization. A Calculated Discharge Curve Algorithm (CDCA) was used to generate Calculated Discharge Curves. The Algorithm procedure is presented. Alkaline manganese cell LR 20-VARTA, load 10 Omega, was used for demonstration of the method. The mathematical calculations were conducted on an IBM personal computer using Symphony software.