IEC 61951-1:2013 specifies marking, designation, dimensions, tests and requirements for portable sealed nickel-cadmium small prismatic, cylindrical and button rechargeable single cells, suitable for use in any orientation. This third edition cancels and replaces the second edition (2003) and its amendment 1 (2005) of which it constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: – addition of several new cell sizes; – introduction of a new cell type J; – creation of Annex A (informative): Capacity of batteries measurement.