loading . . . Redefining batteries as multifunctional materials Nature Reviews Materials, Published online: 17 April 2026; doi:10.1038/s41578-026-00920-8The shift towards electrified transportation, aerospace and distributed technologies demands energy-storage systems that are efficient and structurally integrated. Rechargeable batteries, conventionally implemented as monofunctional components, introduce mass, volume and carbon penalties at the system level, revealing the need to rethink batteries as multifunctional materials rather than stand-alone devices. http://dlvr.it/TS5npR