The 4th International Workshop on Carnot batteries will convene energy storage experts, with a particular focus on thermal energy storage, to discuss the latest research and demonstration of Carnot batteries. The two-day lecture programme will provide a comprehensive overview of innovative research approaches, covering various Carnot battery concepts, their demonstration, and integration into the power grid and sector coupling. Speakers from both science and industry have already confirmed their participation. The workshop is an international platform for the presentation and international visibility of the latest results in Carnot battery research.