Internal resistance play a vital role to make a best performance and long life battery pack. In this video you will know how to measure internal resistance of lithium ion battery pack for electric vehicles. You will also know effects of internal resistance on the battery pack & the factors affects the internal resistance.

Mail: https://motomanicev.com/

For more details pls refer the below link
https://evmania8.blogspot.com/2019/09/internal-resistance-of-lithium-ion.html

Disclaimers: the method suggested to measure the cell IR is basis reference method which for learning & understanding and used by small battery pack manufacturers. At present my advance tools is available to determine the cell IR.