Amendment for UL 1973 Appendix H,
UL 1973,

▍What is CB Certification？

IECEE CB is the first genuine international system for mutual recognition of electrical equipment safety test reports. NCB (National Certification Body) reaches a multilateral agreement, which enables manufacturers to obtain national certification from other member countries under CB scheme on the basis of transferring one of the NCB certificates.

CB certificate is a formal CB scheme document issued by authorized NCB, which is to inform other NCB that the tested product samples conform to present standard requirement.

As a kind of standardized report, CB report lists relevant requirements from IEC standard item by item. CB report not only provides results of all required testing, measurement, verification, inspection and assessment with clearness and non-ambiguity, but also including photos, circuit diagram, pictures and product description. According to the rule of CB scheme, CB report will not take effect until it presents with CB certificate together.

▍Why we need CB Certification?

1. Directly recognized or approved by member countries

With CB certificate and CB test report, your products can be exported to some countries directly.

1. Convert to other countries certificates

The CB certificate can be directly converted to the certificate of its member countries, by providing the CB certificate, test report and difference test report (when applicable) without repeating the test, which can shorten the lead time of certification.

1. Ensure the Safety of Product

The CB certification test considers the product’s reasonable use and foreseeable safety when misused. The certified product proves the satisfactory of the safety requirements.

▍Why MCM? 

● Qualification: MCM is the first authorized CBTL of IEC 62133 standard qualification by TUV RH in mainland China.

● Certification and testing capability: MCM is among the first patch of testing and certification third party for IEC62133 standard, and has finished more than 7000 battery IEC62133 testing and CB reports for global clients.

● Technical support: MCM possesses more than 15 technical engineers specialized in testing as per IEC 62133 standard. MCM provides clients with comprehensive, accurate, closed-loop type of technical support and leading-edge information services.

This month, UL amended UL 1973 by adding nickel-zinc battery requirements and revising some test values for nickel-cadmium batteries and battery systems. The reason is that Appendix H does not include all rechargeable nickel chemicals.
“Nickel-zinc batteries” is added to the description in section 1.4, 6.46, 7.12.1, 7.12.8, 45.8, 45.9, 45.10. 45.11, 45.12, 45.13, 45.14, 45.16, 45.17, 45.18, 45.19.Appendix H, originally Alternative Methods for Evaluating Valve-controlled or Vented Lead-acid or Nickel-cadmium Batteries, is now Alternative Methods for Evaluating Valve-controlled or Vented Lead-acid or Nickel-zinc Batteries. The test conditions suitable for nickel-zinc battery are added to the test methods of overcharge, short-circuit, overdischarge, temperature and voltage resistance.Appendix H modifies the cut-off voltage of nickel-cadmium cells to 1.0 V.Appendix H also adds compression strength and temperature tests at the system level.
According to The General Office of the State Council’s opinion on deepening the reform of electrical and electronic industry management system: lithium-ion batteries and battery packs used in electrical and electronic products, power banks, and power adapter/charger matched with telecommunication end products, will be included in the compulsory product certification. Below are some news about certification & testing standards involved:
The GB/T 35590-2017 General Specification for Portable Power Supply for IT Portable Digital Equipment has been revised. Standards discussion conference will be held on Oct 13, 2022.
The revised version of GB 31241 has not yet been released. It is expected to be released before 3C certification is implemented.Further information remains to be obtained as to which standard should be adopted as the certification and testing standard for lithium batteries for electrical appliances products. At present, the most suitable standard for lithium batteries for appliances is SJ/T 11757-2020.
MCM will continue to focus on the progress provide the latest information for