This part of IEC 63369 addresses general requirements and methodology, whereas intended IEC 63369-2 and intended IEC 63369-3 address applications of the methodology and default values by geographic area. This document provides a comprehensive methodology for the calculation of carbon footprint of industrial type li-ion battery systems from cradle to grave. Second life and/or usage that was not intended when the battery was put on the market is not taken into account in this document. This document along with the other parts of the standard does not apply to portable Li-ion batteries, SLI batteries and electric road vehicle traction Li-ion batteries. The definition of the parameters used for the carbon footprint calculation allows for an improved comparability of results for all rechargeable li-ion chemistries. Classes of representative products are defined in this document to allow comparison inside each class. This methodology, based on the data provided by the battery manufacturer, is mainly intended to allow for a carbon footprint assessment of several battery solutions over the Cumulated Requested Service (CRS). This assessment can be used in the selection process of the battery purchaser or the battery end user. The methodology can also be used for a variety of purposes such as for battery system development, eco-design and participation in voluntary or mandatory programs. The methodology in this document is based exclusively on attributional life cycle assessment (LCA). The carbon footprint calculation of charging equipment and power conversion equipment not necessary for battery functions is not covered in this document.