The outcomes of the project provide the groundwork (criteria) for safe and sustainable use of 2ndL-LIBs as there are large knowledge gaps for such applications. To date, research on potential applications and risks is generally lacking and, consequently, the project outcomes would have high impact in the scientific community and the battery industry. It would be the first time that protocols for failure propagation tests on 2ndL-cells and -batteries are developed based on measurements conducted in state-of-the-art test centres for LIBs. The derived safety criteria are very important for future industrial applications as well as for households (particularly regarding off grid solutions for energy storage). Without the funding, it would not be possible to cooperate intensively within both the national and transnational consortium. The project team is very interdisciplinary and consists of: leading experts in LIB performance testing and safety assessment (i.e., by BAM and INERIS), senior scientists in environmental impact assessment and waste recycling (BOKU), senior/junior consultants for socio-economic impact assessment (Brimatech GmbH) and senior/junior scientists in integrative risk assessment (ITA). Therefore, this unique consortium allows for a holistic approach: Experimental data will be integrated into a LCA and used for integrative risk assessment where stakeholder perceptions will be included. The project results (criteria on safety and sustainability) will be included in ongoing standardization processes (project members are already official delegates). In summary, we provide a basis for safety guidelines (regarding accidents, 2ndL applications, safe disposal, etc.) and for a possible establishment of deposit systems for LIB to promote the reuse and recycling of 1stL-LIBs.