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The Future Flight Standards Hub is designed to accelerate the development of Future Flight demonstrators and wider industry innovation based on emerging best practice, knowledge sharing, and standards support.

  • BSI Flex 1903 v2:2024-06 community preview

    This is an interactive version 2 of BSI Flex 1903. The aim of the standard is to create a lexicon of standard terms and acronyms used in this sector. Please note, content is still undergoing internal review and there may be minor changes at full publication.

    We welcome your engagement and comments on this version to help inform the development of the standard. We would also welcome general feedback including what terms could be considered for future versions and these can be made through our dedicated feedback page .

nominal voltage



  • Definition

    standard or average voltage level assigned to a battery or cell for general identification and classification purposes


    NOTE 1 Provides a theoretical or approximate value that is used as a reference point, actual voltage levels vary within a specified range around this nominal value.

    NOTE 2 Usually associated with the specific type or chemistry of the battery, e.g. lithium-ion batteries usually have a nominal voltage of 3.6 or 3.7 volts per cell.

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