GB/T 43695-2024 "Energy Conversion Efficiency Requirements and Measuring methods for lithium-ion batteries and battery packs" specifies the energy conversion efficiency requirements for lithium-ion batteries and battery packs, and describes the relevant calculation and Measuring methods. This standard applies to all types of lithium-ion batteries and battery packs. Terms include lithium-ion batteries (rechargeable devices for the conversion of chemical energy to electrical energy), lithium-ion battery packs (ready-to-use assemblies consisting of multiple lithium-ion batteries), and capacity efficiency (percentage of the ratio of the output charge quantity when the battery is discharged to the input charge quantity when charging). The implementation of the standard is designed to ensure that the energy conversion efficiency of lithium-ion batteries during charging and discharging meets national requirements, and to improve the efficiency and Reliability of batteries.