A high Rsense value causes the power-source voltage to drop due to IR loss. For minimal voltage loss, use the lowest Rsense value.
A high Rsense value allows lower currents to be measured more accurately because offsets are less significant when the sense voltage is larger. Note that the tolerance and temperature coefficient of the chosen resistors directly affect the precision of any measurement system. For best performance, select Rsense to provide approximately maximum input differential sense voltage of ±51.2mV for the full-scale current. Sense resistors of 5mΩ to 100mΩ are available with 1% accuracy or better. We recommend to use an at lest 3mΩ Rsense for better SOC accuracy.