4R Energy Corporation, a joint venture of Nissan Motors and Sumitomo Corporation focusing on the effective reuse of EV batteries for energy storage systems, is the first organization worldwide to be certified to UL 1974, the Standard for Evaluation for Repurposing Batteries.

Outlining how to sort and grade battery packs, modules and cells that were originally made for electric vehicles (EV) and other applications, UL 1974 helps identify a battery's state-of-health and introduces ratings to determine the viability for their continued use. Through this process, performance-validated "second-life" batteries can be utilized for energy storage systems to provide a safe, reliable, clean energy source.

"Repurposed EV battery safety and reliability have always been top priorities for our company since we were established in 2010," said Eiji Makino, president of 4R Energy. "With UL 1974, our production process has now been certified by one of the world's leading independent, third-party testing and certification organizations."

Anticipating the deployment of second life automotive batteries for energy storage systems, UL initiated a standard development process to address the safety and reliability of repurposing batteries. In October 2018, UL 1974 was published as a bi-national Standard of the United States and Canada.

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