What is UL 1642 Compliance Certification?

ul 1642 is a cell-level safety testing standard developed by Underwriters Laboratories (UL), and it serves as one of the most fundamental and recognized safety compliance thresholds for lithium batteries entering the North American market.

It exclusively targets individual battery cells—the most basic "energy units" within a battery pack—including:

1.Cylindrical Cells (e.g., 18650, 21700)

2.Prismatic Cells (Aluminum shell / Steel shell)

3.Pouch Polymer Cells

4.Primary Lithium Metal Batteries (Non-rechargeable) and Secondary Lithium-Ion Batteries (Rechargeable)

Core Logic of the Standard: Simulating abuse scenarios that cells might encounter during normal use, misuse, transportation, and extreme environments, to verify that they do not catch fire, explode, or project dangerous fragments. It is not a performanCE certification (it does not test capacity, internal resistance, or cycle life).

Compliance Environment Tightening Over the Past Two Years

1.E-commerce Platforms: Amazon US/Canada requires products containing lithium batteries (especially standalone cylindrical cells) to provide UL 1642 test reports issued by NRTL-accredited laboratories. Failure to provide a report may result in product removal.

2.Transportation Side: un 38.3 (Rev. 7) and UL 1642 are two separate test dimensions—the former governs transportation safety, while the latter governs product safety; they cannot replace each other.

3.Downstream Integration: Certifications for downstream battery packs (ul 2054), power banks (ul 2056), light electric vehicles (UL 2271/2849), traction batteries (UL 2580), and energy storage systems (ul 1973) usually require the cell to first pass UL 1642.

In other words, although UL 1642 is technically a "voluntary standard," it has become a de facto mandatory entry credential in the North American market.

UL 1642 Test Items

Electrical Abuse Test

Mechanical Abuse Test

1.Crushing Test: Flat fixture applies pressure up to 17.2MPa (approx. 2500psi) or 50% deformation.

2.Impact Test (Cylindrical Cells): A 9.1kg weight drops freely from a height of 610mm to impact via a 15.8mm steel rod.

3.Round Bar Crush (Pouch Cells): Pressure applied according to cell width grading.

4.Vibration & Shock: Simulating transportation bumps and acceleration shocks.

Environmental Reliability Test

1.Thermal Abuse: Heat at $5^\circ\text{C/min}$ up to $130^\circ\text{C}$ (some conditions up to $150^\circ\text{C}$), hold for 10 minutes.

2.Temperature Cycling: Rapid switching between $-40^\circ\text{C} \leftrightarrow 85^\circ\text{C}$, cycled 10 times.

3.Low Pressure: Simulating high altitude at 15,000meters (11.6kPa) stored for 6 hours.

Projectile / Burning Exposure Test

1.Cells are exposed directly to an external flame to evaluate whether they explode or if flames spread.

Industry Note: Industry data shows that initial test failures frequently occur during crushing tests and thermal abuse tests. Internal pre-testing is recommended prior to submitting samples.

Which Products Require UL 1642?

1.Independently sold lithium cells (18650, 21700, prismatic, pouch)

2.Cells shipped as components to battery pack manufacturers / finished device manufacturers

3.Built-in cells inside consumer electronics, toys, small household appliances, and power tools

4.Replaceable and non-replaceable primary lithium metal / secondary lithium-ion cells

Products Outside the Scope of UL 1642 (Require Corresponding Standards)

Summary

UL 1642 is not an "optional choice," but rather the fundamental safety passport for lithium battery companies expanding into North America:

1.It only certifies individual battery cells, and does not cover battery packs or finished devices.

2.The essence of the testing is "intentional cell abuse," using extreme scenarios to verify no fire and no explosion.

3.It is a high-frequency audit document required for Amazon listing, customs clearance, and key account factory audits.

4.After a cell passes 1642, standards like UL 2054 / 2056 / 2580 still need to be superimposed according to product form.

5.When choosing a laboratory, look for NRTL recognition + ISO 17025 qualification to avoid reports not being accepted by e-commerce platforms.

FAQ

Is a UL 1642 test report the same as UL certification?

No. Platforms like Amazon usually only require a UL 1642 test report issued by an NRTL laboratory; whereas "UL Listing" requires factory inspection, quarterly unannounced audits, and annual fees, which are mostly used for offline supermarkets and engineering procurement.

If a battery cell passes UL 1642, does the battery pack still need to be tested?

Yes. Battery packs must be tested separately according to UL 2054 (or corresponding dedicated standards). The cell report is merely a prerequisite and cannot replace battery pack certification.

What is the difference between UL 1642 and UN 38.3?

UN 38.3 is a transportation safety test (governing sea/air freight), while UL 1642 is a product safety test (governing usage scenarios). They cover different dimensions and both are usually required.

Are the test items the same for pouch cells and cylindrical cells?

Generally similar, but pouch cells use "round bar crush" instead of the traditional impact test, and there are differences in pre-treatment and fixture requirements.

What is the approximate turnaround time and cost for UL 1642 certification?

Industry convention: Testing cycle is about 4–8 weeks; cost varies depending on cell type, sample quantity, and whether UL mark authorization is included. The market price for conventional cylindrical/pouch cells ranges between USD 1,500 – 3,800, subject to specific laboratory quotations.

Can iec 62133-2 directly replace UL 1642?

They are not mutually recognized. The evaluation logic differs between the two systems. Separate UL 1642 testing is still required when selling to the North American market.