On 08.06. 2023, researchers from the BIScaps project teams from the Consiglio Nazionale delle Ricerche - Istituto dTecnologie Avanzate per l'Energia (CNR-ITAE), Italy, and the Spanish National Research Council - National Coal Institute (CSIC-INCAR), Spain, visited the Institute of Electrochemistry and Energy Systems at the Bulgarian Academy of Sciences (IEES-BAS). The guests viewed the renovated laboratories and got acquainted with the experimental technique used in testing symmetric and hybrid supercapacitor systems. Opportunities to optimize the research work were discussed in order to obtain more complete information. Discussions were held in which Dr. Francesco Lufrano and Prof. Antonia Stoyanova expressed their satisfaction with the successful implementation of the tasks set in the project. It was marked that the cooperation between the three organisations should continue after its final completion. A step in this direction is the joint application of IEES-BAS and CSIC-INCAR in the I-Link 2023 project.