IEC 61951-2:20 11规定了适用于任何方向的便携式密封镍金属氢化物、小型棱柱形、圆柱形和按钮式可充电单电池的标记、名称、尺寸、测试和要求。第三版取消并取代了2003年出版的第二版，后者构成了技术修订。与上一版相比，此版本包括以下重大技术变更: -条款4:增加2个参数； -条款5:添加细胞类型“S”和细胞类型“T”； -子条款6.1.2:添加新的圆柱形单元； -子条款7.8:增加了针对“S”细胞的特定测试。

IEC 61951-2:2011 specifies marking, designation, dimensions, tests and requirements for portable sealed nickel-metal hydride, small prismatic, cylindrical and button rechargeable single cells, suitable for use in any orientation. This third edition cancels and replaces the second edition published in 2003 of which it constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- clause 4: addition of 2 parameters;
- clause 5: addition of cells type "S" and cells type "T";
- subclause 6.1.2: addition of new cylindrical cells;
- subclause 7.8: addition of a specific test for "S" cells.