URCM Compact Hydro-Battery — Energy Cascade Technology for Green Storage

This technical preprint describes a compact hydraulic energy storage system — the URCM Compact Hydro-Battery — presented as an engineering realization of the Universal Resonance Cascade Model (URCM). The document contains system architecture, cascade-based control concept, governing hydraulic relations with cascade accounting, loss and efficiency analysis, modularity/scaling notes, recommended validation experiments, and an open defensive disclosure to fix prior art while enabling academic and industrial review. The preprint is published as a defensive disclosure to document prior art and encourage constructive scientific and engineering engagement.