IEC 62877-2:2016适用于与通风铅酸电池和电池一起使用的水，即制备电解液和加满电池或电池的水。与填充电解液相比，填充水的纯度必须满足更高的要求，因为通过定期添加水，工作电解液中的杂质将逐渐增加。本国际标准规定了在制造商没有具体建议的情况下，水的成分、纯度和性质的要求。

IEC 62877-2:2016 applies to water for use with vented lead-acid cells and batteries, i.e. water for preparation of electrolyte and for topping up cells or batteries. The purity of refilling water has to meet higher requirements compared to filling electrolyte, because the impurities in the operating electrolyte will be gradually increased by regular addition of water. This international standard lays down requirements of the composition, purity and properties of water in the absence of specific recommendations from the manufacturer.