This paper deals with designing a simulation model of test setup for deriving information for analyzing the discharging characteristics of a battery in accordance with a predefined discharging profile. As an initial step, in order to determine the parameters from the discharging circuit, the requirements of the batteries were collected. A DC-DC boost converter of 4 kW input power and maximum input current of 100 A is designed for discharging the source battery in a controlled manner using PI controller. From a variable input voltage, boost converter is able to step-up the input voltage to a higher constant dc output voltage using feedback technique. The resistive load is used initially and later the dc motor load is used as a variable load. The constant output voltage of 50 V is obtained. The simulation is done using MATLAB/ SIMULINK. The final outcomes are determining the suitable loads for discharging battery and obtaining the regulated output voltage. © 2018 IEEE.