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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 .

C rate



  • Definition

    measure used to express the rate at which a battery is charged or discharged in relation to its capacity


    NOTE 1 For example, if a battery has a useful capacity of 10 ampere-hours (Ah), and its C rate is 1C, it can be charged or discharged at a rate of 10 amperes. If the C rate is 2C, it can be charged or discharged at a rate of 20 amperes and so on.

    NOTE 2 C rates are commonly used in the context of lithium-ion batteries and other rechargeable battery technologies.

    NOTE 3 C rate is a measure of the rate of charging or discharging relative to a battery’s capacity, while battery power density is a measure of how quickly a battery can deliver or absorb energy per unit of volume or mass. Both concepts are important in assessing different aspects of battery performance, and they can be combined to evaluate the overall capabilities of a battery in specific applications.

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