UN 38.3 Test Summary Verification Requirements for Air Freight Clearance
Air freight clearance for lithium batteries demands a fully compliant UN 38.3 test summary matching cell serials, state of charge, and IATA packing rules.
T5 Short Circuit
Meaning
Regulatory safety testing for lithium batteries evaluates their ability to withstand external electrical shorts without catching fire or exploding. Achieving compliance with the T5 short circuit test is a mandatory requirement for transporting lithium cells globally under international dangerous goods regulations. This assessment ensures that cells can handle high-current faults that might occur during transport or handling.
Battery manufacturers must pass this test to secure transport certifications.
Test Procedure
Laboratory testers conduct the evaluation by heating the cells to fifty-seven degrees Celsius and then connecting the positive and negative terminals through an external resistance of less than one-tenth of an ohm. This short circuit is maintained for at least one hour after the cell temperature has returned to ambient conditions.
Safety Criterion
Passing the test requires that the cell does not exceed a maximum temperature of one hundred and seventy degrees Celsius, and shows no evidence of disassembly, rupture, or fire. The mass loss of the cell must also remain below the limits defined by the transport standard.
Industrial Importance
Securing this safety certification is a mandatory step for battery producers before they can ship products to international markets. Failures require redesigning the cell with better safety features, such as current interrupt devices.