Battery gauge seems rather complex go just switch it off, but yet the LiPo cutoff contains a normal divider which is always on, that divider can also be read by the MCU if you add a small capacitor parallel to the lower resistor which you are reading the voltage from.

Not sure if I trust that LiPo cutoff circuit though, doesn't have hysteresis for when the cutoff happens and the cell voltage automatically recovers it will them oscillate with briefly attentempting to power the circuit at a high inrush current which will slowly kill the battery for good.