Digital Product Passports (DPPs) have increasingly gained attention as enablers of more transparent and traceable electric vehicle battery (EVB) value chains. The new EU Battery Regulation requires all EVBs to have a digital record until 2026 and defines sustainability/ circularity-related requirements to be included in such a digital battery passport (DBP). This study goes beyond the legal requirements by systematically investigating which type of information a DBP would need to contain to comprehensively support sustainability/circularity-related decision-making of value chain actors. This is done by a mixed-methods approach divided into two phases: 1) a literature review, an industry actor survey and an EV user survey, and 2) two sets of interviews with experts from the battery’s End-of-Life (EoL) and Battery Second Use (BoL) phases. The results consist of a refined and prioritized overview of information requirements that are of particular relevance for EVB value chain actors. They also allow for a differentiated insight into the requirements of specific use cases from the EoL and BoL stages. The paper thus serves as the foundation for developing a DPP prototype and for conducting sustainability assessments by providing a holistic perspective on EVB value chain actors’ battery management and data requirements.