IEC 60086-4:2019 specifies tests and requirements for primary lithium batteries to ensure their safe operation under intended use and reasonably foreseeable misuse. NOTE Primary lithium batteries that are standardized in IEC 60086-2 are expected to meet all applicable requirements herein. It is understood that consideration of this part of IEC 60086 might also be given to measuring and/or ensuring the safety of non-standardized primary lithium batteries. In either case, no claim or warranty is made that compliance or non-compliance with this standard will fulfil or not fulfil any of the user°°°s particular purposes or needs. This fifth edition cancels and replaces the fourth edition published in 2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:a) Revised criteria for an explosion;b) Addition of test parameters for the overdischarge test of battery types FR14505 and FR10G445;c) Addition of a new subclause 5.1 Validity of Testing;d) revised pictogram E in Table D.1;e) Addition of Annex E with requirements for child resistant packaging of coin cells;f) Addition of Annex F with recommendations on the use of the KEEP OUT OF REACH OF CHILDREN safety sign.Keywords: lithium batteries