Is additional Annex M evaluation still required if a Li-Ion battery pack certified to IEC 62133:2012 and UL 2054 is used in a host product? Will a battery pack certified by IEC 62368-1 be accepted in a host product investigated to IEC 60950-1?
More specifically you asked: An ITE product has been certified according to latest version of IEC/EN/UL/CSA 60950-1. It includes a rechargeable Li-Ion Battery pack which is certified according to IEC 62133 (ed.2) and it has also a UL 2054 certificate. Now the product will be tested according to 62368-1 3rd version and question is, will the battery require testing alone and/or with host product - is it required that the battery pack and host must be evaluated according to Annex M of 62368-1? What if the battery pack has been certified according to IEC 62133 (ed2) + IEC 62368-1 Annex M when the host product was certified to 60950 - does an update from 60950 to 62368 require Annex M testing again?
In response, based on M.2.1 of IEC 62368-1:2018, a lithium battery pack that complies with IEC 62133 fulfills one of general battery standard requirements required by Annex M. (IEC 62281 or IEC 62485-2 also may be needed based on the mobility of the host product). However, M.2 is only one aspect of Annex M, and applicable sub-clauses M.3 to M.6 and M.10 also are required / essential to evaluate the operation of the battery in the host product (system). Although UL 2054 is permitted as an alternative to IEC 62133 (per Annex DVF of UL 62368-1:2019), use of a UL 2054-compliant lithium battery pack in transportable equipment does not eliminate the need to also determine compliance with M.3 to M.6, and M.10 in the host product / system.
For host products / systems subjected to IEC 60950-1, per 1.5.1, components and subassemblies that comply with IEC 62368-1 are acceptable as part of equipment covered by IEC 60950-1 without further evaluation of the component other than to give consideration to the appropriate use of the component or subassembly in the end-product / system (which is done per 4.3.8, which includes testing of the system under single fault during charging and discharging, etc.). However, no further tests from IEC 60950-1 are needed on the host / system once a lithium battery pack and the host / system construction already has been previously certified according to IEC 62133:2012 and applicable parts of IEC 62368-1:2019 Annex M. (Note for stationary equipment, a national difference in 4.3.8 of UL 60950-1 requires more evaluation for battery packs used in stationary equipment that rely on solid-state circuits and software controls - UL 1973 is one of the appropriate standards).
If a host product already has been certified to IEC 60950-1, but uses a battery pack that was certified to IEC 62133:2012 and Annex M of IEC 62368-1:2014 / IEC 62368-1:2019, again the use of the battery pack must be considered accordingly in the host / system when the host product is upgraded to IEC 62368-1:2019 - some parts of Annex M may be required since Annex M covers some system considerations that are not part of 60950-1, such as M.4.4 – drop test of equipment containing a secondary lithium battery. However, we suggest that you contact UL to discuss this type of complex topic in greater detail since all the specific details of the existing components / constructions / certifications need to be reviewed closely.