Battery leasing has emerged as a promising solution to reduce the high upfront costs of electric vehicles (EVs) and accelerate their adoption, particularly in emerging markets like India. However, the implementation of battery leasing models faces several systemic, financial, operational, and behavioral barriers that are not yet fully understood or empirically validated. This study aims to identify and validate the critical barriers hindering the large-scale adoption of battery leasing systems in India’s evolving EV infrastructure. An initial list of 30 barriers was curated through an extensive literature review and expert consultations, encompassing issues related to consumer perception, regulatory uncertainty, financial risks, infrastructure limitations, and technological interoperability. To achieve consensus-based validation, the Fuzzy Delphi Method (FDM) was employed, engaging 26 experts from academia, industry, and policy domains with deep technical expertise in battery technology, EV systems, and sustainable mobility. Based on fuzzy weightings and defuzzification, 17 barriers were validated for their significance in the Indian context, including high battery costs, lack of standardized charging strategies, inadequate policy support, limited OEM participation, and uncertainty in battery second-life applications. The study not only contributes to the theoretical understanding of BaaS-related challenges but also offers actionable insights for EV manufacturers, battery leasing operators (BLOs), and policymakers. By uncovering the most pressing impediments to battery leasing in India, the findings serve as a strategic roadmap for designing inclusive and sustainable battery-as-a-service ecosystems.