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The aim of the research presented in the article is to use the Metalog family of probability
distributions to assess the technical condition of traction battery packs from electric and hybrid
vehicles. The description of the research object, which is a battery pack from a hybrid vehicle, will
be provided. Then, a system for controlled charging and discharging of individual cells in a battery
pack will be reviewed. It is an essential diagnostic and research device used to determine the
capacity of individual cells. The capacity values of all battery cells will then be analyzed using the
Metalog probability distribution family. The use of this tool allows us to determine the Probability
Density Function for the entire battery pack. Based on this, the diagnostician is able to assess the
technical condition of the tested package and decide on its further fate. It can be intended for repair,
employed as a stationary energy storage facility, or used for disposal. The algorithm for assessing
the technical condition of traction batteries proposed by the authors can be used in all battery packs
regardless of the type of cells used and their energy capacity.