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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 .

battery power density



  • Definition

    amount of power that a battery can deliver per unit of volume or mass, providing an indication of how quickly a battery can be charged or discharged


    NOTE 1 Power density of a battery is typically measured in watts per unit volume or mass, e.g. watts per kilogram.

    NOTE 2 High power density in batteries is desirable for applications that require rapid charging and discharging.

    NOTE 3 Power density is distinct from energy density, which is more relevant for applications that prioritize energy capacity over the rate of energy delivery.

    NOTE 4 Battery power density is a measure of how quickly a battery can deliver or absorb energy per unit of volume or mass, while C rate is a measure of the rate of charging or discharging relative to a battery’s capacity. Both concepts are important in assessing different aspects of battery performance, and they can be considered together to evaluate the overall capabilities of a battery in specific applications.

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