Detailed Interpretation on IEC 62133: 2017+AMD1:2021 (edition 1.1),
IEC 62133: 2017,

▍What is CTIA CERTIFICATION?

CTIA, the abbreviation of Cellular Telecommunications and Internet Association, is a non-profit civic organization established in 1984 for the purpose of guaranteeing benefit of operators, manufacturers and users. CTIA consists of all U.S. operators and manufacturers from mobile radio services, as well as from wireless data services and products. Supported by FCC (Federal Communications Commission) and Congress, CTIA performs a large part of duties and functions that were used to be conducted by the government. In 1991, CTIA created an unbiased, independent and centralized product evaluation and certification system for wireless industry. Under the system, all wireless products in consumer grade shall take compliance tests and those complying with the relevant standards will be granted to utilize CTIA marking and hit store shelves of North American communication market.

CATL (CTIA Authorized Testing Laboratory) represents labs accredited by CTIA for testing and review. Testing reports issued from CATL would be all approved by CTIA. While other testing reports and results from non-CATL will not be recognized or have no access to CTIA. CATL accredited by CTIA varies in industries and certifications. Only CATL which is qualified for battery compliance test and inspection has access to battery certification for compliance to  IEEE1725.

▍CTIA Battery Testing Standards

a) Certification Requirement for Battery system Compliance to IEEE1725— Applicable to Battery Systems with single cell or multiple cells connected in parallel;

b) Certification Requirement for Battery system Compliance to IEEE1625— Applicable to Battery Systems with multiple cells connected in parallel or in both parallel and series;

Warm tips: Select above certification standards properly for batteries used in mobile phones and computers. Do not misuse IEE1725 for batteries in mobile phones or IEEE1625 for batteries in computers.

▍Why MCM？

● Hard Technology: Since 2014, MCM has been attending battery pack conference held by CTIA in US annually, and is able to obtain latest update and understand new policy trends about CTIA in a more prompt, accurate and active way. 

●Qualification: MCM is CATL accredited by CTIA and is qualified to perform all processes related to certification including testing, factory audit and report uploading.

This standard is a combination edition of IEC 62133: 2017 and AMD1: 2021, mainly covering four revision parts (refer to below detailed revision content). It is more about the completeness of the original standard, no too much technical revision, therefore, hardly effect testing ability. But changes in some testing terms may affect testing results.
7.1.2: Revision of charging procedure: no implement the revision on cut-off current of flash charge batteries, but only some text revision and supplement. 7.1.2 Second procedureThis charging procedure applies only to 7.3.1，7.3.4，7.3.5,and 7.3.9.After stabilization for 1 h-and to 4 h, respectively, at an ambient temperature of the highest test temperature and the lowest test temperature， respectively,as specified in Table 2, cells
are charged by using the upper limit charging voltage and maximum charging current, until the charging current is reduced to 0,05 It A, using a constant current to constant voltagecharging method.IEC62133-2:2017+AMD1:2021 CSV – 15- IEC 2021NOTE The voltage and current can vary depending upon the temperature range (e.g. between T2 and T3 or between T1 and T4 of Figure A.1).
Stabilization time within the specified time range should allow for thermal equilibrium to be reached where possible.