PolyJoule, a Boston‑based MIT spinoff, is transforming energy storage with its groundbreaking conductive‑polymer battery technology. These all‑polymer systems are ultra‑safe—eliminating thermal runaway risks, toxic materials, and rare‑earth dependencies—while offering long life, low‑cost, and scalable production with standard factory equipment. Deployed in real‑world grid settings since 2021, PolyJoule batteries have demonstrated over 263 million operational hours across extreme environments. Recent innovations include the second‑generation “Energy Reservoir” cells, which significantly boost energy density while preserving PolyJoule’s hallmark safety, longevity, and sustainability.