UN 38.3 Test T2

Regulatory Requirement

Shippers of lithium batteries must obtain a compliance certificate before offering products for transport. The un 38.3 test t2 is one of eight test protocols that a cell or pack must pass to receive this transport certification. Failure to comply can result in severe fines or shipping delays, making this test a critical milestone in the product development cycle.

Sourcing teams ensure that all cell suppliers provide a valid test report prior to purchasing.

Thermal Protocol

Stress testing of the cells is performed by storing them at seventy-two degrees Celsius for at least six hours, followed by storage at minus forty degrees Celsius for at least six hours. This temperature transition must occur within a maximum time of thirty minutes, and the entire cycle must be repeated ten times. During the un 38.3 test t2, the rapid thermal expansion and contraction test the integrity of the cell seals and welds.

After completing the cycling, the cells must be stored for twenty hours at ambient temperature to ensure that no latent failures develop. Passing the test requires that there is no mass loss, no leakage, no venting, no disassembly, no rupture, and no fire.

Transport Certification

Completion of this thermal test is necessary for securing the legal transport of battery-powered devices. The results are documented in a standardized test summary that must be made available to transport authorities upon request. Sourcing cells that already carry un 38.3 test t2 certification reduces the testing burden on the pack-level integrator.

This proactive compliance strategy prevents shipping bottlenecks and secures the supply chain.