A new water-based battery design developed by Chinese researchers offers increased safety, energy efficiency, and a longer lifespan compared to traditional lithium-ion batteries. The battery utilizes a mixed halogen electrolyte containing iodide and bromide ions, which enhances the electron transfer process and boosts energy density. These advancements pave the way for safer, high-performance aqueous batteries that can rival lithium-ion technology in various applications, including electric vehicles and renewable energy storage systems.