The rapid expansion of the electric vehicle (EV) and energy storage system (ESS) sectors has intensified the need for reliable and safe battery testing laboratories worldwide. Nevertheless, substantial disparities persist among existing international safety standards, resulting in inconsistencies in laboratory operations, certification procedures, and risk management frameworks. This paper presents a comprehensive comparative review of global safety standards applicable to electric battery testing laboratories, emphasizing key regulatory frameworks such as IEC 62619, IEC 62133, ISO/IEC 17025, UL 9540A, and major regional standards from the United States, European Union, China, and Japan. The analysis identifies fundamental similarities, critical divergences, and systemic challenges that hinder global harmonization of safety practices. Furthermore, the study proposes a roadmap for developing an integrated international safety standard aimed at enhancing laboratory safety performance, interoperability, and regulatory alignment within the global battery testing ecosystem.