IEC 62133 Battery Safety Certification: What Electronics Manufacturers Need

IEC 62133 is the safety standard for portable sealed secondary cells and batteries containing alkaline or non-acid electrolytes. For lithium-ion and LiPo batteries — which are in virtually every wearable, IoT sensor, and consumer electronic device — Part 2 (IEC 62133-2:2017) is the applicable standard. Passing IEC 62133 is a prerequisite for CE marking in the EU, is referenced by UL 2054, and enables the CB Scheme for efficient multi-market entry.

Overview

IEC 62133 is published by the International Electrotechnical Commission (IEC). The current relevant edition:

IEC 62133-1:2017: Portable sealed secondary cells and batteries — Part 1: Nickel systems (NiMH, NiCd)
IEC 62133-2:2017: Portable sealed secondary cells and batteries — Part 2: Lithium systems

For EU CE marking, the harmonized standard is EN 62133-2:2017 (identical to IEC, with an EU foreword). For UK products, BS EN 62133-2:2017 applies. When cited in a CE Declaration of Conformity for a product using a rechargeable lithium battery, EN 62133-2 satisfies the safety essential requirement under the LVD or RED.

The standard is managed within the IECEE CB Scheme, which allows a test report from one National Certification Body (NCB) to be recognized in all 57 IECEE member countries, substantially reducing multi-market certification costs.

Applicability

IEC 62133-2 applies to:

Individual lithium-ion and LiPo cells (cylindrical: 18650, 21700; prismatic; pouch/LiPo)
Battery packs assembled from multiple cells, including those with integrated BMS
Intended for portable applications (consumer electronics, wearables, medical monitors, industrial handhelds)

It does not apply to:

Cells used in electric vehicles (EV), where IEC 62660 and ISO 12405 apply
Stationary energy storage (IEC 62619)
Lithium primary (non-rechargeable) batteries (IEC 60086-4)
Button cells for hearing aids (IEC 60086-3)

If your product has a removable battery pack that users replace, certification of the pack is required. If the battery is integrated (sealed into the product), cell-level certification may be sufficient for the battery component, with product-level safety certification (EN 62368-1) covering the overall system.

Key Requirements

IEC 62133-2 test suite covers mechanical, environmental, and electrical abuse conditions:

Electrical tests:

Continuous low-rate charge (overcharge): 1.1× maximum charge voltage for 7 days
Abnormal charge: at specified high current
Forced discharge: for multi-cell series packs
External short circuit: at 20°C and 55°C
Vibration (sinusoidal, 10–55 Hz)

Environmental tests:

Thermal abuse: 130°C oven test (cells only)
Crush test: 13 kN
Drop test: 1 meter onto concrete
Low pressure simulation (altitude)

Electrical protection tests (pack-level):

Overcharge protection circuit verification
Over-discharge protection
Charge temperature protection
Discharge temperature protection

Pass criteria for all tests: no fire, no explosion, no leakage beyond specified limits, no rupture. Temperature rise limits apply to specific tests.

Process & Timeline

Option 1: CB Scheme (recommended for multi-market entry)

Select a National Certification Body (NCB) accredited under the IECEE CB Scheme for IEC 62133. The NCB issues a CB Test Report and CB Certificate.
Submit samples and technical documentation (BMS schematic, cell specifications, charge/discharge parameters).
NCB conducts full test suite or reviews data from a National Test Laboratory (NTL) that conducts testing on behalf of the NCB.
Receive CB Test Certificate and CB Test Report.
Use the CB Report to obtain national certification marks in member countries — UL in the US, CE in the EU (via DoC), PSE in Japan, KC in Korea — typically with reduced or no additional testing.

Chinese NCBs accredited for IEC 62133:

CQC (China Quality Certification Centre): The largest Chinese NCB within IECEE. Labs in Beijing, Shenzhen, Guangzhou. Issues CB certificates recognized internationally.
CESI (China Electrical Equipment Testing Institute): Beijing-based NCB, also IECEE member.

Other accredited labs used for IEC 62133 in China: SGS (Shenzhen), Bureau Veritas, Intertek (Guangzhou), TÜV Rheinland (Guangzhou). These labs are NTLs working under NCBs; the certificate is issued by the NCB.

Timeline: 6–10 weeks for standard cell/pack testing. Complex packs with custom BMS: 10–14 weeks.

Cost:

CB test at CQC or equivalent Chinese NCB: $3,000–7,000 for a standard LiPo pouch cell pack
Repeat certification for minor pack changes (different cell supplier, same chemistry): $1,500–3,000
If cells already hold a CB certificate (from cell manufacturer), pack-level testing scope is reduced — electrical protection tests remain, mechanical tests may be waived: $1,500–3,000

Option 2: Self-declaration (EU only)

For CE marking, manufacturers may use EN 62133-2 test reports from any ISO/IEC 17025 accredited laboratory — CB certificate not required. This is cheaper if you only need EU compliance. However, for US (UL 2054), Korea (KC), or Japan (PSE), separate testing is required anyway. CB Scheme is more economical for multi-market products.

Getting It Done from China

When sourcing batteries from Chinese manufacturers of power electronics and portable devices, the most efficient path is to use cells with an existing CB certificate from the cell manufacturer, then conduct pack-level testing only:

Request the CB Test Certificate from the cell manufacturer (model number, IEC 62133-2, issuing NCB name).
Verify the certificate is current (certificates typically have 5-year validity, subject to factory audits).
Confirm the pack BMS is designed to operate within the tested cell parameters.
Conduct pack-level electrical protection testing: $1,500–3,000.

CATL (18650, prismatic), ATL (LiPo pouch), EVE Energy, and BYD all maintain IEC 62133-2 CB certificates for their standard cell ranges. Ask your battery supplier for the CB certificate number; then verify it in the IECEE online database (iecee.org) to confirm authenticity.

Common Mistakes

Including battery certification document verification in your pre-shipment inspection catches mismatched CB certificates before goods leave China.

1. Treating “CE certified battery” as IEC 62133 compliant. CE marking on a battery product commonly means only UN 38.3 transport testing was done — not IEC 62133 safety testing. These are entirely different requirements. UN 38.3 = safe for transport. IEC 62133 = safe for end use. Both are required for CE-marked consumer electronics with rechargeable batteries.

2. Pack testing without verifying cell certification scope. If the cell CB certificate covers a different configuration (cell count, connection type) than your pack, the certificate may not apply. Read the scope of the CB certificate carefully — it specifies the test configuration.

3. Not accounting for BMS changes. Swapping the BMS IC (e.g., from Texas Instruments BQ25895 to a cheaper alternative) changes the protection parameters. If the BMS behavior falls outside the parameters tested under IEC 62133-2, the existing certificate no longer applies and retesting is required.

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