As lithium-ion batteries reach end-of-life in growing volumes, advancing safe and scalable pathways for reuse, repurposing, and recycling is becoming increasingly important. This presentation will explore key challenges and opportunities across the battery circularity ecosystem, including fire safety, traceability, second-life applications, and stakeholder alignment. Drawing on recent research, industry insights, and standards initiatives, this session will also highlight the critical role that standards play in advancing a circular battery economy. This includes UL 1974, which provides a framework for evaluating batteries for second-life use, and UL 3601, which supports the measurement and reporting of battery circularity.