Is Wintonic Battery Company UL & IEC 62133 Certified? 2026

TL;DR

Wintonic Battery & Magnet Co., Ltd. has public evidence of UL and IEC 62133 compliance for certain lithium-ion battery cells, including UL file MH47276 and CB certificate SG PSB-BT-07559 issued by TÜV SÜD. But these certifications are product-specific, not company-wide. Buyers should always request the full certificate package for their exact model and verify it in official databases before treating any Wintonic product as compliant.

Is Wintonic Battery Company Certified for UL and IEC 62133 Compliance?

The short answer: yes, for specific battery cell products, based on publicly available evidence. No, if you mean a blanket certification covering every product Wintonic manufactures.

Wintonic’s /Intertek verified supplier profile lists UL file MH47276 for battery cells (valid 2017-07-28 to 2027-04-09) and CB certificate SG PSB-BT-07559 from TÜV SÜD for Li-ion rechargeable cells (valid 2025-12-12 to 2030-12-12). Wintonic’s own quality page and official website also reference UL, CB, IEC 62133, UN38.3, BIS, ROHS, WERCS, and MSDS documentation across applicable products.

That is meaningful evidence. It is not the whole story.

Whether Wintonic battery company is certified for UL and IEC 62133 compliance on the specific cell, pack, or system you plan to buy depends on whether the certificate scope matches your exact product model, chemistry, voltage, capacity, and factory of origin. This article explains what those certifications actually mean, what they do not prove, and exactly how to verify them before placing an order.

Explore Wintonic’s 18650 battery cells to see the kind of products where cell-level UL and CB documentation is most directly relevant.

What “UL and IEC 62133 Compliance" Actually Means

These two terms get lumped together constantly, but they refer to different things.

UL Is Not One Standard

UL (UL Solutions) operates as both a standards development organization and a testing/certification body. When someone says a battery is “UL certified," the natural follow-up question is: certified to which UL standard?

The relevant UL standards vary by product type:

UL 62133-2:2020 is harmonized with IEC 62133-2:2017, meaning the two standards share a common technical foundation for portable lithium battery safety. But a UL 1642 cell listing is not the same thing as a UL 2054 pack certification or a UL 2271 e-bike battery certification.

Other laboratories recognized by OSHA as Nationally Recognized Testing Laboratories (NRTLs), such as TÜV, SGS, Intertek/ETL, CSA, and MET, can also test and certify products to UL standards. Each uses its own certification mark. So “UL certified" can mean the product was tested by UL itself, or it can mean a different NRTL tested the product against a UL standard.

IEC 62133-2 Is the International Lithium Battery Safety Standard

IEC 62133-2:2017 + AMD1:2021 specifies safety requirements and tests for portable sealed secondary lithium cells and batteries under intended use and reasonably foreseeable misuse. It replaced the older combined IEC 62133:2012 structure by splitting nickel systems (Part 1) from lithium systems (Part 2).

The standard covers tests including continuous charging, external short circuit, drop, thermal abuse, compression, overcharge, forced discharge, vibration, and shock. It also addresses design documentation, safety markings, and packaging requirements. TÜV SÜD practitioners on LinkedIn have noted that IEC 62133-2 compliance includes design-check areas like general safety considerations, safety information, and marking, not just the physical abuse tests most people think about.

CB Certificates Support International Recognition

A CB certificate, issued under the IECEE CB Scheme, helps manufacturers gain recognition of IEC-based testing across participating countries. The CB certificate comes with a CB test report, and together they can streamline access to multiple national markets. But a CB certificate does not automatically replace local market requirements everywhere. The buyer still needs to confirm whether their destination country accepts the CB route for the product in question.

What Wintonic’s Listed Certificate Numbers Suggest

Based on the publicly available /Intertek verified supplier profile and Wintonic’s own documentation, here is what the certificate references indicate:

These two references suggest that Wintonic has obtained UL-related certification for battery cells and CB/IEC 62133 evidence for Li-ion rechargeable cells. The UL file has been active since 2017, and the CB certificate appears recently renewed with validity through 2030.

This is a solid starting point. It is not a finish line.

The certificate numbers do not tell you which specific cell models are covered, which chemistry or form factor is included, or whether the pack you want to buy falls within scope. For example, Wintonic produces a range of cylindrical cells across 21700 lithium-ion formats and other sizes. Each model may or may not appear on the certificate’s covered-product list.

Why This Does Not Automatically Cover Every Wintonic Product

This is the most important point in the entire article, and the one most commonly missed by both suppliers and buyers.

Companies are not “IEC 62133 certified." Products are.

A UL or IEC 62133 certificate applies to specific cells, packs, or assemblies tested under defined conditions. Here is why that distinction matters for Wintonic buyers:

A certified 18650 cell does not automatically certify a battery pack built from that cell. The pack assembly introduces new variables: BMS design, protection circuitry, wiring, connectors, enclosure materials, thermal management, and pack configuration (series/parallel arrangement). Each of these can change the safety profile.

A cell certificate does not automatically certify a laptop battery, e-bike battery, or rack-mounted ESS. An engineering discussion on Stack Exchange captures this well: practitioners note that a battery component certificate can be necessary but not sufficient for whole-device compliance. The finished product may still need its own safety, EMC, and environmental review.

Custom OEM/ODM changes can void existing evidence. If a buyer requests a different enclosure, altered BMS settings, private-label packaging, a different cell inside the pack, or a new connector, the original test report may no longer apply. A compliance practitioner shared on LinkedIn how discovering a built-in rechargeable lithium battery without IEC 62133 testing changed an entire CE project timeline, forcing a choice between waiting for the supplier to test or arranging independent testing.

UN38.3 is not a substitute. This is a transport safety test, not a product safety certification. PHMSA states that lithium cells and batteries offered for transportation must pass UN38.3 design tests, and test summaries must be available on request. But passing UN38.3 tells you nothing about whether the battery meets UL or IEC 62133 product safety requirements.

Practitioners on Reddit confirm this confusion is widespread. One e-bike forum thread directly asks whether UN38.3 testing is “comparable to UL certification," and the consensus answer is no: they test different things for different purposes.

UL vs IEC 62133 vs CB vs UN38.3: A Plain-English Comparison

How to Verify Wintonic’s UL and IEC 62133 Documents Before Ordering

Whether you are an importer, distributor, OEM buyer, or compliance engineer asking if Wintonic battery company is certified for UL and IEC 62133 compliance, the verification process is the same. Follow these steps.

Step 1: Identify Your Exact Product

Start with specifics. Are you buying a cell or a pack? What chemistry (NCM, LFP, lithium polymer)? What cell format (18650, 21700, 26650, 32700, prismatic, pouch)? What voltage, capacity, and pack configuration? What application (laptop, power tool, e-bike, solar storage, rack ESS)?

A 32700 LiFePO4 cell has completely different certification needs than a 48V e-bike battery pack or a 51.2V rack-mounted energy storage system.

Step 2: Match the Product to the Right Standard

Do not accept a generic “UL/IEC certified" claim. Ask which specific standard applies:

• For a bare cell: UL 1642, UL 62133-2, or IEC 62133-2?
• For a battery pack: UL 2054, UL 62133-2, IEC 62133-2, or UL 2271?
• For e-bike or light EV use: does your market require UL 2271 or system-level UL 2849? New York City, for example, requires UL 2271 certification for powered bicycle and mobility device batteries.
• For energy storage: does your market or insurer require UL 1973, UL 9540, or IEC 62619?

Step 3: Request Full Certificate Documents

Ask Wintonic for complete certificate PDFs, not screenshots. Specifically request:

1. UL certificate or listing details (file number, standard, product/model list, holder, factory, active status)
2. CB certificate and CB test report (certificate number, IEC standard edition, models covered, issuing NCB/CBTL)
3. IEC 62133-2 test report matching your exact model
4. UN38.3 test summary
5. SDS/MSDS
6. A change-control statement confirming no BOM, BMS, factory, or configuration changes since the certificate was issued

Step 4: Verify in Official Databases

Use these databases to confirm what the supplier tells you:

• UL Product iQ for UL file/listing verification
• IECEE CB certificate database for CB certificate status
• The issuing certification body’s own database (TÜV SÜD, SGS, Intertek, etc.)

Reddit e-bike communities have built entire spreadsheets trying to verify battery certification claims. Users consistently emphasize that the database check is the real proof, not the marketing page or product listing. One practitioner from an e-mobility testing lab shared that buyers should distinguish “certified to UL," “tested to UL," and actual NRTL certification with a public database listing.

Step 5: Apply the 5-Match Rule

Before accepting any Wintonic certificate as applicable to your order, confirm all five of these match:

1. Model number on the certificate matches the product you are buying
2. Electrical rating (voltage, capacity) matches
3. Chemistry and cell format match
4. Manufacturer and factory address match
5. Standard edition and certificate validity are current

If any one does not match, treat the document as incomplete until clarified.

Which Wintonic Product Families Need Extra Checking?

Wintonic manufactures cylindrical Li-ion/NCM cells, LiFePO4 packs, laptop replacement batteries, e-bike/scooter packs, and rack/wall energy storage products. Each family has different compliance considerations.

For buyers looking at 48V e-bike battery packs, always ask whether the certification covers the complete pack with its BMS, not just the cells inside it.

For ESS buyers evaluating products like Wintonic’s 51.2V rack-mounted storage batteries, be aware that residential and commercial energy storage systems often face additional fire safety, electrical code, and insurer requirements that go well beyond cell-level IEC 62133-2 testing.

Certification Wording Red Flags

Practitioners on Reddit report that vague UL claims are extremely common in the battery industry. Here are specific phrases that should trigger additional questions:

• “Designed to UL standard" does not mean certified.
• “Tested to UL standard" does not mean listed or certified unless a recognized certification body issued a formal certificate with a database listing.
• “UL cell inside" does not mean the pack is UL certified. The pack is a different product.
• “Battery certified" does not mean the complete device or system is certified.
• “Certificate available on request" should still be verified independently.
• Expired, suspended, or database-absent certificates are not valid compliance evidence.
• Low-resolution or cropped certificate images missing the model annex are insufficient.
• Supplier provides only UN38.3 and SDS but claims this proves UL or IEC 62133 compliance. It does not.

A LinkedIn practitioner from the custom battery pack industry noted that a full UN38.3 + IEC 62133 + UL 2054 testing campaign can commonly run $8,000 to $25,000 when a certification gap surfaces during a project. That cost, combined with weeks of testing lead time, is why buyers should confirm Wintonic’s UL and IEC 62133 compliance documentation matches their specific product before the order is placed, not after.

Real-World Context: What the Community Says About Wintonic

On Reddit’s r/18650masterrace community, at least one user reported salvaging Wintonic cells from laptop battery packs and finding them comparable to lower-performance laptop cells, suitable for moderate-use power banks and radio gear. This is not compliance proof, but it confirms Wintonic cells have circulated in real laptop battery supply chains and DIY communities.

More broadly, e-bike buyers on Reddit who have tried building UL certification spreadsheets emphasize how difficult it is to verify claims. The consistent advice: check the lab database, look for the certification mark on the physical product, and match everything to the certificate scope. A claimed certification on a product page is the start of verification, not the end.

Why Buyers Should Ask Early

Missing certification documentation does not just create compliance risk. It creates business risk. Products held at customs, rejected by marketplace compliance teams, refused by insurers, or flagged by retailers all trace back to the same root cause: the buyer assumed “certified" meant their product was covered without checking the scope.

When evaluating whether Wintonic battery company is certified for UL and IEC 62133 compliance for your order, treat the question as product-specific from day one. Send Wintonic the target SKU, destination market, application, and your buyer or retailer compliance requirements. Ask for the matching UL/CB/IEC 62133 certificate package, UN38.3 test summary, SDS/MSDS, and written confirmation that the documents cover the exact model and configuration you plan to purchase.

For buyers exploring Wintonic’s energy storage lineup, start with products like the 5kWh energy storage system or 48V vehicle battery packs and request the specific compliance documentation relevant to your market and application before finalizing any order.

Frequently Asked Questions

Is Wintonic Battery UL certified?

Wintonic has public evidence of UL certification for certain battery cells, including UL file MH47276 listed on an /Intertek verified profile. Buyers should verify the exact product model and applicable UL standard in the UL Product iQ database before relying on this claim for their specific purchase.

Is Wintonic IEC 62133 certified?

Wintonic presents CB/IEC 62133-related evidence for certain Li-ion rechargeable cells, including CB certificate SG PSB-BT-07559 issued by TÜV SÜD. Buyers should request the full CB certificate and test report to confirm whether their exact model is covered and which edition of IEC 62133-2 applies.

Does Wintonic’s UL certification cover all their battery packs?

No. UL and IEC 62133 certification is product-specific and model-specific. A cell-level certificate does not automatically certify a battery pack, laptop battery, e-bike pack, or energy storage system built using those cells. Each product level may require its own testing and certification.

Is UN38.3 the same as IEC 62133?

No. UN38.3 is a transport safety test required for shipping lithium cells and batteries. IEC 62133-2 is a product safety standard for portable sealed lithium cells and batteries. Passing UN38.3 does not mean a product meets UL or IEC 62133 safety requirements.

What standards apply to Wintonic e-bike batteries?

E-bike battery packs may require UL 2271 (battery system for light electric vehicles) and the complete e-bike may need UL 2849 (electrical system evaluation). IEC 62133-2 alone is typically not sufficient for e-bike battery compliance in markets like New York City, which explicitly mandates UL 2271.

What standards apply to Wintonic energy storage products?

Energy storage systems generally require standards beyond IEC 62133-2. Depending on the market and application, relevant standards include IEC 62619 for industrial/stationary lithium batteries, UL 1973 for stationary battery systems, and UL 9540 for complete energy storage systems. Buyers should confirm which standards their local codes, insurers, and utilities require.

How do I verify Wintonic’s certificates are real?

Check UL file MH47276 in UL’s Product iQ database. Check CB certificate SG PSB-BT-07559 in the IECEE CB certificate database or TÜV SÜD’s certificate portal. Confirm that the model number, electrical ratings, chemistry, factory address, and certificate dates all match the product you intend to order.

What documents should I request from Wintonic before ordering?

Request the UL certificate or listing details, CB certificate and CB test report, IEC 62133-2 test report for your specific model, UN38.3 test summary, SDS/MSDS, a product label sample showing the certification mark, and a written statement confirming the documents match the exact model and configuration being purchased.