At the Ulsan National Institute of Science and Technology, a team of scientists has developed batteries that can stretch. Perhaps they will soon replace the usual lithium-ion batteries in new mobile gadgets. The jaboticab plant inspired them to invent such batteries. It is very similar to grapes, only berries grow directly on a tree trunk. Korean inventors have developed a carbon-polymer hybrid composite as a stretchable base. It contains carbon filler. The latter consists of nanotubes coated with black carbon elements. Scientists, experimenting, found that the efficiency of preserving composite intrinsic conductivity is high even with fast and severe deformations. Due to this, the material is suitable for use in lithium-ion batteries, which stretch quite strongly and are equipped with an aqueous electrolyte. As testing has shown, prototypes of such a battery guarantee uninterrupted energy conductivity during bending and after 500 recharge cycles. One of the creators of the project, Professor Seo, hopes that the results of their work will allow the production of nanocomposites that have mechanical and electrochemical properties and are able to stretch, which is useful in various fields. Today, curiosity for electronics equipped with flexible properties has increased significantly. This means that they will need special power sources – extensible. Previously, researchers proposed an incredible number of methods to achieve this goal. However, so far not a single method has had the necessary properties: • resistance to mechanical stress; • significant electrical conductivity; • scalability of the entire production process.