This project focused on developing a testing and data acquisition system for CATL Battery Modules and Packs, aimed at validating performance and safety for EV applications. The system enables automated execution of standard test protocols and synchronized measurement of critical cell-level data, supporting research, and quality assurance. Key technologies included C programming of the Webasto MT-30 Battery Tester to perform standard test cycles such as constant current charge/discharge, HPPC, VDI, cooling, and UDAN Charge-driven profiles. Simultaneously, a custom CATL Battery Module Interface Board (CBMIB) was designed to connect CATL 228Ah and 302Ah modules to a high-resolution DAQ system, capturing individual cell voltages and thermistor temperatures. The PCB was designed to trigger the DAQ system to start record the data. Among the most notable accomplishments was the successful coordination of C-triggered commands with live DAQ data collection, ensuring timestamp integrity and enabling comprehensive test result analysis. A key challenge was ensuring electrical and data compatibility between the interface board, battery module, and the DAQ. Future improvements include expanding the interface design to support additional battery formats or higher-voltage architectures and adding additional testing scripts to insure an efficient battery module.