Can a 10mOhm sense resistor be used with a 20,000mAh battery with the MAX17055 fuel gauge?

The FuelGauge algorithm is agnostic to the sense resistor. The currents have units of uV/R_Sense and the capacities have units of uVh/R_Sense.
 
When a 10 mOhm sense resistor is used, the LSB for current is 0.15625mA and the LSB for capacity is 0.5 mAh.  For a 20,000 mAh battery, the translated value should be 40000 integer, or 0x9C40, which is higher than 0x6000, and shouldn’t be used.  To get around this, there are two options:

1.  Use a 5 mOhm sense resistor.
   1. This option is not recommended due to the low current usage mode.  With a 5 mOhm RSense, the 0x4E20 programmed capacity is fine, but the input to the current measurement is half the burden voltage as a 10mOhm sense resistor.  For best coulomb counter performance, the sense resistor should match the current range of the application, and a 10 mOhm is a good fit for the discharge levels of this application.
2. Use a CGAIN value to scale the currents/capacities digitally.
   1. If a CGAIN value of 0x0200 is used, it will still measure all currents on the higher dynamic range with the 10mOhm R_Sense, but the digital values will be scaled, allowing a 20,000 mAh battery to be used.  If CGAIN = 0x2000 is used, the LSBs change to 0.3125 mA and 1 mAh.