I. What is UN 38.3?

UN 38.3 is the abbreviation for Section 38.3 of the UN Manual of Tests and Criteria (Recommendations on the Transport of Dangerous Goods), maintained by the UN Subcommittee of Experts on the Transport of Dangerous Goods (UN SCOE).It is the core international standard governing the transport safety of lithium batteries.

This standard defines a series of mandatory safety tests that lithium batteries (including lithium-ion and lithium-metal batteries) and battery-powered equipment must pass before shipment.Its purpose is to verify that batteries will not fail dangerously under extreme transport conditions.

Major global air cargo organizations (IATA, ICAO) and the International Maritime Dangerous Goods (IMDG) Code all require shippers to provide a valid UN 38.3 Test Summary document.

II. The 8 Mandatory Tests of UN 38.3

All 8 tests must be passed for a compliant report to be issued:

• T1 Altitude SimulationSimulates low-pressure environment (11.6 kPa), typical of aircraft cargo holds.Test duration: minimum 6 hours.

• T2 Thermal TestEvaluates thermal stability through 10 high‑low temperature cycles from +75°C to -40°C.Each temperature step holds for at least 6 hours.

• T3 Vibration TestSimulates transport vibration using sine sweep from 7 Hz to 200 Hz.Total duration: 3 hours.

• T4 Shock TestSimulates transport impact with half‑sine wave shock at 150 gn peak acceleration.18 shocks total (3 axes, 3 positive + 3 negative per axis).

• T5 External Short CircuitPerforms external short circuit at (55±2)°C.Observed for fire, explosion, or casing rupture.

• T6 Impact / CrushLithium‑ion batteries undergo impact testing;lithium‑metal batteries undergo crush testing to verify safety under mechanical damage.

• T7 Overcharge TestSubjects batteries to overcharging at a specified rate to assess overcharge protection.

• T8 Forced Discharge TestConnects batteries in series with an external power source for forced over-discharge to verify safety margins.

III. Scope of Application & Exemptions

UN 38.3 applies to all lithium batteries shipped by air or sea:

• Single cells
• Battery packs
• Batteries installed in equipment
• Batteries packed with equipment

Conditional exemptions apply in some cases, such as small batteries:

• Single cell rated energy ≤ 2.7 Wh
• Lithium content ≤ 1 g for lithium‑metal batteries

Always confirm the latest IATA Dangerous Goods Regulations and consult a qualified testing body for applicability.

IV. Test Report & Compliance Documentation

Per IATA and ICAO requirements, shippers must provide a UN 38.3 Test Summary including:

• Product name and model
• Battery type (lithium‑ion / lithium‑metal) and rated parameters (voltage, capacity, energy)
• Test items and results
• Testing laboratory information
• Test completion date

Many airlines and freight forwarders require reports from third-party accredited laboratories.Confirm document format with your carrier before shipment.

From the Testing Laboratory

Guangdong Energy Storage Testing Technology Co., Ltd.is qualified for lithium battery testing with CNAS L13753 and CMA (202019014977) dual accreditation.

We provide professional UN 38.3 testing and certification services for lithium cells, batteries and packs:

• Full 8‑test UN 38.3 evaluation (T1–T8)
• Compliant third-party test reports for air and sea freight customs clearance
• Pre-test technical consultation on procedures and sample requirements

V. FAQ

Q1: Which products need UN 38.3 testing?

All lithium batteries (Li‑ion, Li‑metal) and battery‑containing equipment shipped by air, sea, or land must comply.This includes consumer batteries, power batteries, energy storage batteries, and raw cells.Exporters, importers and manufacturers must ensure testing is completed and a valid Test Summary is provided.

Q2: What are the 8 UN 38.3 tests?

T1 Altitude Simulation, T2 Thermal Test, T3 Vibration, T4 Shock, T5 External Short Circuit, T6 Impact/Crush, T7 Overcharge, T8 Forced Discharge.All must be passed.

Q3: How long is a UN 38.3 report valid?

UN 38.3 reports do not have a fixed expiry date.However, re-testing is required if there are material changes to design, materials, manufacturing process, rated capacity or voltage.IATA DGR requires up-to-date test summaries. Consult a lab for major product changes.

Q4: Difference between UN 38.3 and IEC 62133?

• UN 38.3: Focuses on transport safety; mandatory for air/sea shipment.
• IEC 62133‑2:2017: Focuses on product safety throughout lifecycle, mainly used for CB certification of portable batteries.

Some export products require both standards.

Conclusion

Lithium battery transport safety is critical to global supply chain compliance.Complying with UN 38.3 is a legal obligation and key to reducing transport risks.

For detailed UN 38.3 testing services, contact Guangdong Energy Storage Testing Technology Co., Ltd. for professional technical support.