The modern battery is the outcome of electrochemistry, materials science and decades of experimentation. This collection gathers the seminal papers (Nernst equation, Butler–Volmer kinetics, porous-electrode theory, intercalation chemistry, SEI formation, the layered-oxide revolution) that collectively taught us how ions migrate, how interfaces evolve, and how energy can be reversibly stored in matter. They continue to guide every advance from silicon anodes to solid-state designs.