Testing Lab of Power Supply/ IT / AV Products

Cross-border shipping of power and battery products demands one essential document above all others — the UN38.3 transport report. Whether your product is a smartphone battery, portable power station, or power tool battery, every air, sea, or land shipment across borders will require this report from an accredited testing laboratory. This guide covers which products need UN38.3 testing, what each of the eight test items actually measures, and answers to the most frequently asked questions from manufacturers.

1. What Is the UN38.3 Transport Report

UN38.3 is the mandatory testing standard for lithium battery transport safety defined in Part III, Section 38.3 of the UN Recommendations on the Transport of Dangerous Goods. Developed by the UN Committee of Experts on the Transport of Dangerous Goods, it serves as the global compliance threshold for all cross-border lithium battery shipments.

The core purpose of the UN38.3 report is to verify that lithium batteries will not leak, vent, disassemble, rupture, or ignite when exposed to extreme transport conditions — including high-altitude low pressure, severe vibration, and extreme temperature fluctuations. A battery that passes UN38.3 testing is certified as having adequate safety margins under normal shipping conditions.

All cross-border transport of lithium batteries or devices containing lithium batteries — by air, sea, road, or rail — requires UN38.3 compliance. This is not a regional regulation unique to one country; it is a globally unified standard established under the International Air Transport Association's (IATA) Dangerous Goods Regulations (DGR) and the International Maritime Organization's (IMO) International Maritime Dangerous Goods (IMDG) Code.

2. Which Power and Battery Products Require UN38.3

The UN38.3 scope centers on "lithium batteries" as the primary determinant, covering all types of lithium-ion and lithium-metal batteries, plus end devices containing lithium batteries. Six major product categories are outlined below:

1. Lithium-Ion Battery Products

The broadest category under UN38.3, including smartphone batteries, laptop batteries, digital camera batteries, camcorder batteries, wireless communication batteries, portable DVD batteries, and CD/MP3 player batteries. All lithium-ion cells and battery packs require UN38.3 testing.

2. Lithium-Metal Battery Products

Including coin cells (such as CR2032), medical device backup batteries, and primary lithium-manganese batteries. Lithium-metal batteries are non-rechargeable with higher chemical activity, and their UN38.3 test parameters differ from lithium-ion batteries.

3. Power Tool and EV Batteries

Including EV battery packs, electric road vehicle batteries, power tool batteries, and hybrid vehicle batteries. High-capacity power batteries with greater energy density are priority inspection targets for customs and airlines.

4. Portable Power Stations and Power Banks

Portable power stations, power banks, and home energy storage systems are all typical applications of lithium-ion battery packs. Due to their high capacity and output power, these products face stricter state-of-charge restrictions for air freight.

5. Devices Containing Lithium Batteries

When lithium batteries are shipped installed inside a device, the device must be accompanied by a UN38.3 report for its internal batteries. Typical examples: Bluetooth earphones, electric scooters, drones, laptops, smartphones. Exception: small devices with only coin-type lithium-metal batteries (e.g., watches) where a single battery's lithium content does not exceed 0.3g may qualify for simplified requirements in certain transport scenarios.

6. Other Chemical Battery Types

Nickel-metal hydride (Ni-MH), nickel-cadmium (Ni-Cd), and lead-acid batteries may also require UN38.3-related testing under specific test procedures. Lead-acid batteries additionally require a dangerous goods packaging certificate and sea transport appraisal report for export.

3. The Eight UN38.3 Test Items Explained

UN38.3 comprises eight mandatory tests simulating the extreme conditions lithium batteries may encounter during transport:

T.1 Altitude Simulation　Batteries are placed in a low-pressure environment of ≤11.6kPa at 20±5°C for at least 6 hours, simulating high-altitude flight conditions. Pass criteria: no leakage, venting, disassembly, rupture, or fire; open-circuit voltage ≥90% of pre-test value.

T.2 Thermal Test (Temperature Cycling)　Batteries undergo 10 cycles between 72±2°C and -40±2°C, with a minimum 6-hour soak at each extreme temperature, transitions ≤30 minutes, and 24 hours at room temperature — totaling at least one week. Pass criteria: performance degradation ≤20%, no leakage, venting, disassembly, or fire.

T.3 Vibration　Simulates transport vibration — a logarithmic sinusoidal sweep from 7Hz to 200Hz within 15 minutes, repeated 12 times across three axes over 3 hours. Pass criteria: no structural damage or functional abnormality.

T.4 Shock　Small cells/cells: 150g, 6ms; large-capacity batteries: 50g, 11ms half-sine pulse, 3 times per mounting direction, 18 shocks total. Pass criteria: no leakage, disassembly, or fire; voltage ≥90% of pre-test value.

T.5 External Short Circuit　Battery externally shorted at 55±2°C with external resistance <0.1Ω, sustained until battery temperature returns to 55±2°C and held for 1 hour. Pass criteria: external surface temperature ≤170°C; no fire or disassembly within 6 hours.

T.6 Impact / Crush　Impact: 9.1kg mass dropped from 61±2.5cm onto a battery positioned over a 15.8mm bar; Crush: 13kN force applied to deform battery by 50%. Pass criteria: external surface temperature ≤170°C; no fire or disassembly within 6 hours.

T.7 Overcharge　Applicable to rechargeable battery packs — overcharged at 2× maximum continuous charging current and 2× maximum charging voltage for 24 hours. Pass criteria: no disassembly or fire.

T.8 Forced Discharge　Battery connected in series with a 12V DC power supply, forced discharge at maximum discharge current. Pass criteria: no disassembly or fire.

4. Air Freight vs. Sea Freight Compliance Differences

Air and sea freight compliance requirements for battery exports differ significantly, and manufacturers need to prepare distinct document packages for each:

Air freight requirements　UN38.3 report + Air transport condition appraisal + MSDS + Dangerous goods declaration. Airlines typically require submission of dangerous goods packaging certificate, MSDS, and UN38.3 report 72 hours in advance. When a cell exceeds 20Wh or a battery exceeds 100Wh, UN-certified packaging is mandatory, with a net weight limit of 35kg per package and Class 9 hazard labels required.

Sea freight requirements　UN38.3 report + Sea transport appraisal + MSDS + Dangerous goods packaging certificate (including performance certificate and usage certificate). Sea freight permits batteries with state of charge ≤50%, with "State of Charge: 50%" marked on the packaging. The packaging certificate is valid for 1 year and must be applied for from the local customs authority by the manufacturer.

The three core documents — UN38.3 report, MSDS, and dangerous goods packaging certificate — form the mandatory compliance foundation for cross-border booking and dangerous goods customs clearance. No single document can replace the others.

5. Frequently Asked Questions

This article was generated with AI assistance. Content is for reference only and does not constitute any certification commitment or legal advice. Please refer to the latest official regulations.

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