A major shift is underway in global dangerous goods transportation. The United Nations Sub-Committee of Experts on the Transport of Dangerous Goods has introduced a comprehensive, hazard-based classification system. This crucial update introduces five new battery abuse tests designated as T9 through T13 to complement the existing UN 38.3 testing baseline.
The Core Baseline: The Existing UN 38.3 T1-T8 Tests
- T1 (Altitude Simulation): Verifies structural integrity in low-pressure environments like unpressurized aircraft cargo holds.
- T2 (Thermal Test): Rapidly cycles temperatures from extreme cold to high heat to assess seal and internal electrical integrity.
- T3 (Vibration): Simulates continuous mechanical wear, shifts, and shocks encountered during rugged transit.
- T4 (Shock): Replicates sudden, high-impact acceleration or deceleration from accidental dropping or transport collisions.
- T5 (External Short Circuit): Evaluates whether the battery can safely withstand an external electrical short circuit without catching fire or dismantling.
- T6 (Impact / Crush): Measures internal physical resilience against heavy physical mass deformation or crushing force.
- T7 (Overcharge): Assesses the battery’s safety features during extreme overvoltage beyond its maximum rated charge limits.
- T8 (Forced Discharge): Forces electrical discharge back through a cell to evaluate its internal structural limits against abuse.
The New Frontier: Introducing Tests T9 to T13
Once robustness is demonstrated through the baseline tests, products enter the new hazard-based assessment tier. Under this updated framework, a cell or battery pack will face a maximum of three new tests tailored precisely to its product architecture.
T9 & T11: Propagation of Thermal Runaway
Test T9 is conducted on individual cells, whereas Test T11 is applied directly to multi-cell battery packs. These evaluations determine whether a controlled thermal runaway event inside a singular unit will catastrophically propagate to adjacent cells.
T10 & T12: Gas Volume Measurement
Triggered on an “as-needed” basis, Test T10 measures cell gas release, while Test T12 calculates the total gas volume emitted by a battery pack. This quantifies the precise volume of emissions pushed out during an emergency venting phase.
T13: Gas Flammability Limit Test
Applicable to both individual cells and completed battery packs when requested, Test T13 establishes the precise flammability and composition profile of the vented gases. This determines whether the emissions present an explosive hazard during a transit failure.
The New Hazard Alphabet: Product Types A to F
Following a designated regulatory transition period where legacy codes (UN 3480, UN 3481, UN 3090, UN 3091) remain valid, all products will eventually transition to a hazard grading scale from Type A (Most Severe) to Type F (Least Severe). Proper shipping names and newly issued UN numbers are determined by battery chemistry combined with the unit’s specific behaviour at its transport SOC:
| Hazard Type | Technical Classification Criteria | UN Number (Sodium & Li-Ion) | UN Number (Lithium Metal) |
|---|---|---|---|
| Type A | High-risk profile exhibiting thermal propagation, severe heat hazards, and large volumes of flammable and toxic gas exceeding 25L or 500L boundaries. | UN 3600 | UN 3601 |
| Type B | Units generating notable heat hazards alongside a large quantity of flammable gas, regardless of propagation limits. | UN 3602 | UN 3603 |
| Type C | Profiles marked by high heat emissions and a large quantity of non-flammable gas falling between 25L and 500L. | UN 3604 | UN 3605 |
| Type D | Characterised by no thermal propagation, standard heat levels, and flammable gas managed strictly between 0.25L and 25L limits. | UN 3606 | UN 3607 |
| Type E | Safer configurations demonstrating no propagation, normal heat, and flammable gas volumes successfully restricted under 0.25L. | UN 3608 | UN 3609 |
| Type F | The safest tier, reserved for cells and packs displaying chemical content hazards only, with zero propagation, zero heat, and minimal gas below 0.25L. | UN 3610 | UN 3611 |
Navigating the New Packing Instructions (PI 940 – PI 943)
The specific hazard type your product receives dictates the logistical packaging requirements needed for compliant transport. To meet compliance, logistics managers must officially track cell/battery SOC parameters or build physical propagation prevention features directly into the product casing:
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PI 940 (Applicable to Hazard Types E & F)
Designed for lower-risk profiles. Allows general transport provisions or strong, rigid outer packaging/casings. Enforces a strict rule against electrical short circuits or accidental activation.
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PI 941 (Applicable to Hazard Types A, B, C, & D)
The core standard for standard configurations and configurations exceeding 12 kg. Mandates the use of robust Packing Group II (PG II) certifiable outer boxes or industrial casings.
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PI 942 (Applicable to Hazard Types A & B)
Focuses on advanced hazard mitigation. Requires explicit, complementary packaging layouts that use physical separations or mechanical isolation methods designed to halt thermal runaway propagation entirely.
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PI 943 (Applicable to Hazard Types A, B, & C)
The highest tier of containment. Demands specialized non-combustible and non-conductive packaging materials to safely isolate high-volume or highly flammable thermal venting events.
Navigating Special Provision 376 (SP376) for Damaged or Defective Batteries
When a cell or battery is identified as damaged or defective, it completely bypasses standard transport procedures and falls under the strict mandates of Special Provision 376 (SP376). Because compromised lithium batteries present a significantly elevated risk of fire or explosion, logistics managers cannot treat them as regular cargo.
Compromised batteries are chemically unstable, subjecting them to rigorous testing conditions like vibration, thermal shock, or extreme overcharge would be highly hazardous. Instead, shippers substitute standard UN 38.3 compliance protocols with the strict containment requirements of SP376, moving from standard packing instructions to specialized emergency packing tracks (P908 or P911)
P908/LP904: Stable Damaged Batteries- Physically compromised units (e.g., dented, cracked, or deformed casings) that remain chemically stable and are not liable to react violently during normal transit.
P911/LP906: Unstable / High-Risk Batteries- Critically compromised units liable to rapidly disassemble, produce flames, generate dangerous heat levels, or emit toxic and flammable gases.
Key takeaways
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The Baseline Stays: All batteries must still pass the traditional UN 38.3 T1-T8 mechanical and physical transit tests before facing the new tier.
- New Abuse Testing: Tests T9 through T13 introduce hazard-based criteria focusing heavily on thermal runaway propagation, gas volume emission, and gas flammability.
- The Hazard Alphabet (Types A-F): Legacy shipping codes will eventually transition to a strict hazard grading scale ranging from Type A (Most Severe) to Type F (Least Severe)
- Impact on Packaging: Your final hazard classification directly determines your logistical requirements under new Packing Instructions PI 940 through PI 943.
- SOC Strategy: Because testing evaluates batteries at their transport State of Charge (SOC), engineering or shipping your batteries at a lower SOC can drop them into a less restrictive hazard tier significantly reducing packaging costs.
