Core Viewpoint - The article discusses the development of a biodegradable biohydrogel battery that addresses the limitations of traditional batteries in biomedical applications, emphasizing the need for high-performance energy sources that are compatible with biological systems [4][7]. Group 1: Biohydrogel Battery Development - Researchers from Zhejiang University have designed a biodegradable biohydrogel battery using light polymerization and 3D printing techniques, showcasing excellent mechanical properties and biocompatibility [4]. - The biohydrogel battery operates at a voltage of 1.5 V, providing a current range of 0.001-6 mA, which supports tissue regeneration and cardiac pacing applications [4][8]. Group 2: Hydrogel Characteristics and Applications - Hydrogels, as three-dimensional cross-linked polymer networks, exhibit properties similar to biological tissues, making them suitable for various biomedical applications such as drug delivery and tissue engineering [6]. - The integration of gallium-based liquid metals with hydrogels enhances their conductivity and mechanical performance, promoting their use in flexible bioelectronic devices [6]. Group 3: Challenges and Solutions in Energy Systems - Traditional batteries face significant limitations in biomedical applications due to poor biocompatibility, non-degradability, and rigidity, which can harm surrounding tissues [7]. - The development of a flexible, biodegradable power source using conductive ion hydrogels and InGa3-Cu nanoparticles addresses these challenges, maintaining stable current during degradation [7]. Group 4: Performance Metrics - The biohydrogel battery features a high printing precision of 50 micrometers, with tensile strain and compression rates of 200% and 95%, respectively, aligning with the mechanical properties of biological tissues [8]. - It operates in dual current modes, facilitating microcurrent for tissue regeneration and high current for effective cardiac pacing [8].