This paper presents a study of the impact of EU battery regulations, specifically Regulation (EU) 2023/1542, on end-of-life batteries, primarily focusing on repurposing within the supply chain. Qualitative data was gathered from stakeholders in the battery supply chain using a combination of surveys and interviews. Interviews provide deeper insights into aspects beyond the survey's scope, enhancing our understanding of how EU regulations influence the supply chain. The findings reveal a nuanced landscape where EU regulations bring advantages through defined producer responsibilities, improved safety standards, and facilitated data sharing. The study explores various circular business models within this context, emphasizing the need for a functional value network and effective stakeholder coordination. This research contributes valuable insights as the EU pursues circularity in the battery supply chain. By addressing barriers, capitalizing on opportunities, and promoting collaboration, it supports a sustainable and circular future in the EV battery supply chain, optimizing initial investments and aligning with the energy transition goals.