IEC 61951-2:2017 is also available as IEC 61951-2:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61951-2:2017 specifies marking, designation, dimensions, tests and requirements for secondary sealed nickel-metal hydride small prismatic, cylindrical and button cells and batteries, suitable for use in any orientation, for portable applications.
This edition includes the following significant technical changes with respect to the previous edition:
- addition of battery type;
- addition of ‘F’ (high recovery type) designation for cells and batteries;
- addition of ‘I’ (low self-discharge type) designation for cells;
- revision of Figure 3 (6.1.3.1);
- addition of “optional pip” note to positive contact;
- changed leader line position from pip to flats of positive contact (B and G).