This product is a button battery test fixture designed for reliable electrochemical testing of coin cells, including EIS and CV measurements. It accommodates CR20 and CR24 batteries with thickness ranges of 1.5–3.5 mm and 2–4 mm, respectively, and can be customized for other sizes. The fixture features corrosion-resistant materials and a sealed cavity, ensuring stable contact and preventing electrolyte leakage during testing. By rotating the fixture at different angles, it adapts to varying battery thicknesses, making it suitable for research applications requiring reproducible performance characterization. Its straightforward construction supports convenient installation and consistent test results in battery development and quality control workflows.