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Lifepo4 Battery fuel guage

Currently I am setting up , a LifePO4 battery pack made of 55 cells at 3.3v each where I would like to determine the state of charge of the complete pack . 

I have reviewed some Ic`s from TI, but could not spot the most adequate one. 

I would like to know if the best solution is to place an Ic on each cell, or  make use of a single IC which monitors the complete pack. 

Any help is appreciated 

Kind Regards 

AC