The article reviews the recent progress and future prospects of Battery-Supercapacitor Hybrid Devices (BSHs). BSHs, which combine high-capacity battery-type electrodes with high-rate capacitive electrodes, are designed to offer high energy and power densities, long cycling life, and environmental friendliness. The review covers the fundamental principles, structure, and classification of BSHs, focusing on various types such as Li-/Na-ion BSHs, acidic/alkaline BSHs, BSHs with redox electrolytes, and BSHs with pseudocapacitive electrodes. It highlights recent advancements in materials, electrochemical performance, and emerging functionalities like flexibility and transparency. The article also discusses the limitations and challenges, including the development of aqueous high-voltage window BSHs and integrated 3D electrode/electrolyte architectures.The article reviews the recent progress and future prospects of Battery-Supercapacitor Hybrid Devices (BSHs). BSHs, which combine high-capacity battery-type electrodes with high-rate capacitive electrodes, are designed to offer high energy and power densities, long cycling life, and environmental friendliness. The review covers the fundamental principles, structure, and classification of BSHs, focusing on various types such as Li-/Na-ion BSHs, acidic/alkaline BSHs, BSHs with redox electrolytes, and BSHs with pseudocapacitive electrodes. It highlights recent advancements in materials, electrochemical performance, and emerging functionalities like flexibility and transparency. The article also discusses the limitations and challenges, including the development of aqueous high-voltage window BSHs and integrated 3D electrode/electrolyte architectures.