MARBEL is a EU-funded project that aims at the implementation of circular economy (CE) principles in batteries packs (BP) made by design and to support the automotive sector for the widespread penetration of electric vehicles (EV). Ecodesign methodology with a constant follow-up throughout the project will ensure a strong sustainable design foundation. A Unified Approach will provide a comparative framework for BP LCAs as well as cohesion for the two methodologies: LCA and LCC that in parallel will allow to explore possible "trade-offs”