Article MAX17048 datasheet shows, a particular voltage level on battery pack can have various state of charge level

MAX17048 - Relationship between Battery voltage and State of charge (SOC)

Open-circuit voltage (OCV) of a Li+ battery uniquely determines its SOC. One SOC can have only one value of OCV.

Vcell = (OCV - IR drop),Where Vcell is a function of OCV, load, temperature, age, time and impedance.

SOC can have many values of Vcell , so Vcell cannot uniquely determine SOC.

 

 

 

 

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