ABSTRACT Polymer electrolytes (PEs) are widely regarded as a promising platform for solid‐state batteries (SSBs), offering the potential to simultaneously achieve high energy density with improved safety. However, in current literature, PEs spanning liquid‐percolated gels, liquid‐assisted quasi‐solids, and truly polymer‐governed solids are often indiscriminately grouped as solid polymer electrolytes (SPEs), obscuring their distinct ion transport mechanisms, interfacial behaviors, and practical p