Charge retention tests are assessments used to measure how well a material can hold an electric charge over time. These tests are important for evaluating the performance of various electronic components, such as capacitors and batteries, which rely on charge storage for their functionality. During a charge retention test, a sample is charged to a specific voltage and then monitored to see how much charge it retains after a set period. This helps determine the efficiency and reliability of the material in applications like energy storage and electronic devices.