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However, the energy conversion efficiency is often constrained by excessive swelling, which dilates nanochannels and degrades permselectivity. Here, we present a bicontinuous\u2010network hydrogel (BCNH) engineered by precisely modulating the hydrophilic and hydrophobic phases to achieve high\u2010performance osmotic energy conversion. Benefiting from the BCN structure, the hydrophilic ion\u2010conducting pathways are spatially confined by a percolating hydrophobic matrix, which dramatically suppresses swelling. This structural restraint preserves high permselectivity and enhances mechanical robustness. The resulting BCNH membrane, which simultaneously offers high permselectivity and rapid ionic flux, delivers an outstanding osmotic power density of 21.07\u00a0W\u00b7m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , significantly outperforming conventional homogeneous hydrogels. By integrating cation\u2010selective and anion\u2010selective BCNHs into flexible full cells, we achieve a high\u2010power density of 10.07\u00a0W\u00b7m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , enabling the scalable fabrication of highly flexible battery arrays. Combining integrated high selectivity, ultralow swelling, and robust mechanical properties, the BCNH platform establishes a transformative material foundation for advanced flexible electronics and sustainable energy conversion technologies.\n                  <\/jats:p>","DOI":"10.1002\/adma.74906","type":"journal-article","created":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T11:55:01Z","timestamp":1788350101000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Flexible Osmotic Energy Batteries Enabled by Stacked Bicontinuous\u2010Network Hydrogels"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-1759-202X","authenticated-orcid":false,"given":"Jingyan","family":"Shi","sequence":"first","affiliation":[{"name":"School of Astronautics Beihang University  Beijing 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