IEC 62619 vs UL 1973: Which Energy Storage Certification?

A battery supplier says its product is certified, but the certificate names a different standard than your project specification. That mismatch can delay approvals or force design changes. IEC 62619 and UL 1973 both address battery safety, but they are not interchangeable labels; the right choice depends on the product, market, and approval route.

## What each standard covers

IEC 62619 sets safety requirements and tests for secondary lithium cells and batteries used in industrial applications. Its scope includes stationary applications such as energy storage, telecom, and UPS, as well as certain motive-power uses. It addresses hazards associated with cells and battery systems, including electrical, thermal, and mechanical risks.

UL 1973 is a North American safety standard for batteries used in stationary and auxiliary power applications. It is commonly specified for batteries in energy storage systems, telecom, and UPS installations. The applicable edition, product category, and certification scope matter: a certificate for one battery configuration does not automatically cover every pack built from the same cells.

Neither standard is a substitute for checking the complete system's requirements. A battery may need to meet one or both standards, while the inverter, installation, fire protection, and grid connection are assessed against separate codes and requirements. UN38.3 concerns transport testing; it does not establish that a battery is certified to IEC 62619 or UL 1973.

## How to decide

Start with the destination market and the authority that will approve the installation. For a project led by IEC-based specifications, IEC 62619 may be requested. For a North American project, UL 1973 is often specified by the customer, insurer, or authority having jurisdiction. Confirm the requirement in writing instead of inferring it from the project location alone.

Then match the standard to the actual deliverable. A cell-level document, a battery-module evaluation, and a certification for a complete battery system describe different scopes. Check that the model number, chemistry, enclosure, BMS, rated voltage, capacity, and permitted operating conditions match the configuration you intend to purchase.

A useful procurement comparison is: IEC 62619 is an international industrial battery safety standard often used in IEC-oriented markets; UL 1973 is a North American battery safety standard often called out in stationary-power procurement. Both can involve design review and testing, but the test program and certification scope differ. Neither by itself confirms compliance with every site, system, or transport requirement.

For an LiFePO4 pack, do not treat chemistry as proof of compliance. Ask how the tested design controls cell overvoltage and undervoltage, overcurrent, temperature, and other relevant fault conditions. Review BMS protection behavior, cell and pack ratings, and the operating limits for charge and discharge, including C-rate and temperature.

- Identify the country, project specification, and approving authority.

- Confirm whether the requirement applies to cells, modules, the battery pack, or the complete system.

- Match the certificate and report to the exact model and hardware revision offered.

- Check whether both IEC 62619 and UL 1973 are explicitly required, and request evidence for each.

## Certification evidence to review

Request the certificate and its scope, not only a supplier statement or logo. Verify the issuing organization, standard and edition, certificate status, product models covered, and any conditions or limitations. If the project depends on a test report or listing, confirm which documents the buyer, integrator, or authority will accept.

Ask about changes since testing. Replacing cells, altering the BMS, changing enclosure materials, increasing capacity, or revising thermal design can affect whether evidence applies to the supplied product. The supplier should explain change control and identify when engineering review or additional testing is needed.

Also clarify system-level responsibilities. The battery supplier may provide battery certification evidence, while the system integrator handles inverter compatibility, installation design, site controls, and other approvals. For solar storage, telecom, and UPS projects, align interfaces and operating limits early, including SOC and SOH reporting where the application requires them.

A practical specification should name the required standard and edition, product level, target market, exact model, and evidence needed at delivery. Include related requirements separately, such as UN38.3 for transport and any applicable system or installation approvals. This prevents a general claim of certification from being mistaken for project acceptance.

For buyers developing a new battery configuration, Newbeebattery can act as an OEM/ODM custom pack partner to align pack design and certification planning with the target application and market. Confirm the proposed certification route and evidence before locking the specification or production schedule.

## Conclusion

IEC 62619 and UL 1973 address battery safety in overlapping industrial and stationary applications, but their scopes and acceptance routes differ. Use the project specification and authority requirements to choose, verify that the evidence covers the exact pack, and determine separately whether both standards or additional approvals are needed.