Helping battery manufacturers ship lithium and sodium batteries legally and safely worldwide.
Providing testing evidence that batteries comply with the UN Manual of Tests and Criteria, Part III, Subsection 38.3.
UN38.3 testing is essential for demonstrating that lithium batteries can be transported safely and in compliance with international regulations. By choosing Resonate Testing, manufacturers benefit from expert testing services delivered by one of only a few UK-based laboratories capable of carrying out UKAS-accredited UN38.3 testing. This helps verify product safety, support regulatory compliance, and streamline access to global markets, backed by reliable results and professional guidance throughout the testing and qualification process.
UN 38.3 is a transportation safety standard used to demonstrate that lithium and sodium batteries can be safely transported through normal distribution channels. It is not a performance standard; its purpose is transport safety under reasonably foreseeable shipping conditions.
It applies to:
Lithium-ion cells
Lithium-ion battery modules
Lithium-ion battery packs
Lithium metal batteries
Sodium-ion cells, modules and battery packs
Battery systems integrated into equipment
Resonate Testing provides UN 38.3 testing, lithium and sodium battery transport certification, battery abuse testing and thermal runaway testing at cell, module and battery pack level from its dedicated battery testing facility in Newry, Northern Ireland.
Lithium and sodium batteries can be classified as Dangerous Goods for transport. Before commercial shipment, manufacturers and integrators normally need evidence that batteries comply with the UN Manual of Tests and Criteria, Part III, Subsection 38.3.
UN 38.3 testing for lithium-ion and sodium-ion cells, modules and packs
Support for batteries integrated into equipment
Battery abuse, propagation and thermal runaway expertise
Transport compliance support for road, sea and air shipment
Vibration testing
Environmental testing
Electrical abuse testing
Ready to ship your batteries worldwide? Speak to the battery safety team about UN 38.3 testing for lithium and sodium batteries, battery transport certification, battery abuse testing and thermal runaway testing at the Newry facility.
UN 38.3 testing is commonly required across:
BESS and ESS
Telecommunications
UPS and critical power systems
Material handling equipment, AGVs and AMRs
Marine battery systems
Railway applications
Industrial equipment and machinery
Aerospace development and defence programmes
Common assumptions can create transport risk. A UN 38.3 certificate for a cell does not automatically cover a battery pack, and a certified module does not automatically cover a full battery assembly.
Packs can include additional electrical protection, interconnects, enclosures, battery management systems and mechanical structures that alter transport safety behaviour.
Failure to comply can lead to shipment rejection, carrier refusal, customs delays, regulatory penalties, increased insurance risk and Dangerous Goods transport violations.
UN 38.3 Test programme
Resonate Testing performs the complete UN 38.3 programme for lithium and sodium battery chemistries. Additional handling drop testing can also be requested to represent real-world logistics and user handling environments. UN 38.3 is not simply a menu of independent tests. Defined groups of samples normally progress through a prescribed sequence, often called a cascade. Earlier exposures may influence the response to later tests, so replacing cascade testing with unrelated one-off tests requires a clear regulatory basis. The testing includes the following requirements:
| Standard / Guidance | Primary Focus | Typical Relevance |
|---|---|---|
| T1 – Altitude Simulation | 50,000 ft simulation at ambient temperature for 6 hours. | Cells and batteries |
| T2 – Thermal Test | 10 cycles, holding at hot and cold temperature extremes for 6 or 12 hours, plus 24-hour stability. | Cells and batteries |
| T3 – Vibration | Sine vibration from 7 Hz to 200 Hz, 12 sweeps, 3 hours per axis, with parameters depending on battery size. | Cells and batteries |
| T4 – Shock | Half-sine shock: 3 per axis, 18 shocks total, with parameters depending on battery size. | Cells and batteries |
| T5 – External Short Circuit | 57 ± 4 °C external case stabilised, then short circuit with external resistance <0.1 ohm at ambient temperature. Continued for >1 hour after the external case temperature has returned to 57 ± 4 °C, or after the external case temperature has decreased by half of the maximum temperature increase observed. | Cells and batteries |
| T6 – Crush | Two flat surfaces at approximately 1.5 cm/s at the first point of contact. Continued until the applied force reaches 13 kN ± 0.78 kN, the cell voltage drops by at least 100 mV, or the cell is deformed by >50% of original thickness. | Cells |
| T6 – Impact | 9.1 kg ± 0.1 kg mass dropped from 61 ± 2.5 cm using a frictionless, vertical sliding track, 90° to horizontal, with a Type 316 stainless steel bar on the cell. | Batteries |
| T7 – Overcharge | Test charge current is twice the manufacturer’s maximum. Test voltage is the lesser of twice the manufacturer’s recommended charge voltage (CV), 22 V, or 1.2 times CV if CV is more than 18 V. Charge time is 24 hours at ambient temperature. | Cells |
| T8 – Forced Discharge | 12 V D.C. power supply with initial current equal to the maximum discharge current; discharge using a resistive load at ambient temperature, monitored for 7 days. | Cells |
Alongside UN 38.3 transport testing, Resonate supports deeper battery safety and abuse programmes at cell, module and pack level.
Thermal runaway and propagation testing
Cell, module and battery pack abuse testing
Fire testing
Overcharge, crush and nail penetration studies
IEC 62619 and RTCA DO-311A testing
Technical review: review battery architecture and shipping configuration.
Test planning: define sample requirements and the qualification route.
Testing: complete testing at the Newry facility – UK and EU Access assured.
Assessment: review safety performance against acceptance criteria.
Reporting: issue detailed technical reports and UN 38.3 evidence documentation summary.
The Newry facility provides large-scale battery abuse chambers, thermal runaway facilities, fire testing capability, environmental chambers, vibration testing systems, gas analysis equipment and instrumented propagation testing.
In addition to UN 38.3 testing, the Newry facility can support wider battery safety, environmental and abuse testing programmes, enabling manufacturers to investigate battery behaviour, verify transport compliance and generate the evidence required for global shipment of battery-powered products. Our experienced engineering team can assist with test planning, sample selection, reporting and transport compliance requirements throughout the qualification process.
UN 38.3 testing is a key requirement for the transport of lithium batteries, but successful completion of the test programme is only one part of transport compliance. Batteries must also be correctly classified, marked and labelled before they can be shipped through international distribution networks.
Lithium batteries are assigned specific UN identification numbers based on their chemistry and shipping configuration. The most common classifications include:
These UN numbers are used on transport documentation and battery shipping marks to help carriers identify the contents of a package and apply the appropriate handling requirements.
Class 9 Lithium Battery Hazard Label
Some lithium battery shipments are classified as fully regulated dangerous goods and require the Class 9 Lithium Battery Hazard Label, also known as the Class 9A Lithium Battery Label.
This label is commonly required for larger battery shipments transported under dangerous goods regulations and provides a clear indication that the package contains regulated lithium batteries requiring specialised handling during transport.
| Specification | Capability |
|---|---|
| Test Type | UN 38.3 lithium battery transportation testing |
| Battery Focus | Lithium-ion and lithium metal cells and batteries intended for transport |
| Test Areas | Altitude simulation, thermal testing, vibration, shock, external short circuit, impact/crush, overcharge and forced discharge |
| Applicable | UN Manual of Tests and Criteria Part III, Sub-section 38.3, IATA Dangerous Goods Regulations (DGR), ICAO Technical Instructions, IMDG Code, ADR and customer requirements |
| Component Types | Lithium-ion cells, lithium metal cells, battery packs, battery modules and batteries contained in or packed with equipment |
| Planning Inputs | Cell chemistry, battery configuration, watt-hour rating, lithium content, state of charge, sample quantity and transportation scenario |
| Instrumentation | Temperature monitoring, voltage monitoring, visual inspections and customer-specified data acquisition where required |
| Assessment Focus | Leakage, venting, disassembly, rupture, fire, mass loss, voltage stability and transport safety compliance |
| Test | UN 38.3 test programme review, sample quantity verification, transportation classification support, safety review and reporting scope definition |
Test planning: define sample requirements and the qualification route.
Testing: complete testing at the Newry facility – UK and EU Access assured.
Reporting: issue detailed technical reports and UN 38.3 evidence documentation summary.
An electronic circuit or control system integrated into a battery pack that monitors operational parameters (voltage, current, temperature) and ensures the battery operates within safe limits.
An assembly of one or more lithium-ion cells, complete with electrical connections, housing, and electronic protective devices.
A single electrochemical unit that converts chemical energy into electrical energy, containing a rechargeable lithium-ion positive and negative electrode.
The mechanical failure of a cell container or battery case caused by internal pressure, resulting in ejected solid fragments.
The release of excessive internal pressure from a cell or battery in a manner intended by design to prevent rupture.
A test state where a rechargeable battery is subjected to a charging current that exceeds the manufacturer’s specified limits.
A direct connection between positive and negative terminals of a cell or battery that provides a virtual zero resistance path for current flow.
Alongside UN 38.3 transport testing, Resonate supports deeper battery safety and abuse programmes at cell, module and pack level.
Thermal runaway and propagation testing
Cell, module and battery pack abuse testing
Fire testing
Overcharge, crush and nail penetration studies
IEC 62619 and RTCA DO-311A testing
Resonate Testing supports UN 38.3, IEC 62619, IEC 62133, UN ECE R100, RTCA DO-311A, RTCA DO-160 and customer-specific transport qualification programmes.
Fast. Flexible. Accessible.
Whether you’re looking to contact us for the first time or have another testing requirement, we’d love to hear from you.
