Should Poland make reserves of components for batteries, as should fuel reserves? This and another questions are answered by Arkadiusz Sumarowski - the manager and expert in power technology and vice president of the board of BTO Sp. z o.o. We discuss the challenges of technological sovereignty of Poland and Europe in the battery sector, noting the dependence on abroad supply of lithium-ion cells. Our guest emphasizes the importance of diversifying the sources of components and the request to safe supply chains through prior acquisition of key cells. The expert besides stresses that, without the improvement of its own factories in Europe, maintaining full independency and continuity of production will be difficult.