The maritime industry and the EU have rightly prioritized safety, longevity and circularity in electrification solutions, including passive propagation standards defined by class societies and EU Regulation 2023/1542. However, high-volume battery chemistry options following the automotive industry are limited to nickel-rich NMC for energy density and power or LFP for lifetime and safety. Mid-nickel, single-crystal NMC can be engineered to combine all these attributes, particularly thermal stability and lifetime, with high charge rate and power. This is demonstrated in >60Ah production format cells using a novel recycled NMC grade with a low carbon footprint and FEPS’ ongoing cathode R&D.