In Sri Lanka’s automotive and industrial sectors, numerous brands of lead acid batteries are widely utilized. These include both locally manufactured and imported products. All batteries must conform to the quality standards established by the Sri Lanka Standards Institution (SLSI) prior to commercial distribution. The Arthur C Clarke Institute for Modern Technologies (ACCIMT) and the National Engineering Research & Development Centre (NERDC) serve as key institutions in the testing and validation of lead acid batteries. These organizations employ advanced imported equipment to evaluate performance metrics in compliance with national standards. Among the essential equipment used are high current DC electronic loads, which are critical in various electronic load applications, especially in battery dis-charge testing. This study presents the design and development of a DC electronic load system, designated as the C10 and C20 Capacity Tester (Model: CT2024), specifically engineered to evaluate the discharge characteristics of lead acid batteries. The system features a 7-inch resistive touch display with a graphical user interface (GUI) and is controlled via a microcontroller based architecture, providing precise and user friendly operation. Experimental results demonstrated that the prototype delivered highly precise voltage and current measurements, confirming its effectiveness in battery testing applications. Given the high cost of commercial DC load systems, compounded by freight and potential repair expenses, the proposed proto-type, “C10 and C20 Capacity Tester for Batteries,” provides a cost effective alternative while maintaining reliable performance for battery capacity testing. Its locally developed design ensures ease of repair and maintenance. Furthermore, the system incorporates Internet of Things (IoT) functionality, enabling real time remote monitoring of voltage, current, and battery status. Ongoing development aims to integrate a parallel battery charging system within the same unit.