➀ Empa researchers have developed a 3D-printed, biodegradable mushroom battery that could power sensors in agriculture or remote research areas. The battery, made from two types of mushrooms, is non-toxic and biodegradable. ➁ The battery is a microbial fuel cell that uses the metabolic processes of mushrooms to generate electricity. ➂ The researchers are working to improve the battery's performance and durability, and to explore the use of other mushroom species.