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INA190-Q1: Voltage measurement

Part Number: INA190-Q1
Other Parts Discussed in Thread: INA190

Hello,

I want to use the INA190A2-Q1 for voltage measurement of a battery. The idea is to use the following circuit:

By measuring the current in the 1k shunt resistor and determine the cell voltage from that. The cells have a voltage between 2.5V and 4.5V, which translates into a current in the shunt resistor of 25uA to 45uA. 
Using 0.1% accuracy resistors and taking offset voltage and bias current of the INA190-Q1 into consideration it seems doable to reach an accuracy of  50nA +/- 1% of reading. 

Given it is not the standard use of the INA190-Q1 and that the current measure are quite low, we would like to have your advice on this. 
Please let us know if you have any recommendations/ advices,

Best regards,

Jules