1. Measure the voltage drop from the rated current until the temperature stabilizes;

2. 1.2 times the rated current for 1 hour and cut off the current for 15 minutes. Loop 100 times;

3. Power on for 1.5In 1h and measure the voltage drop;

4. Measure the voltage drop using the same method as 1. Requirements: The voltage drop change before and after the test should not exceed 10%, and the mark is still clear and legible, and the end cap solder joints do not show any deterioration.