Sorry I misinterpreted your question.
But I have taken some of those measurements:
First, I measured the on-board resistor divider at 9.47k, 0.974k, which is a little bit off from the nominal 10k/1k.
Then I measured actual warning and low-battery thresholds at 3.65V and 3.44V with the default settings of 3.5V and 3.3V. However, this is with some custom Betaflight code developed by ETHeli that allows removing the hysteresis from the thresholds. (The ability to turn hysteresis on and off should be available soon in Betaflight.) I found that the large amount of built-in hysteresis makes setting levels particularly problematic for single-cell machines. Accuracy is also affected by the individual value of the 3.3V power supply to the CPU on the flight controller, which is also used as the reference voltage for the A/D converter.
Finally, for my setup, without hysteresis, settings of 3.2V and 3.1V worked best, using a modified version of Betaflight 2.5.4. I have found that actual voltage to the controller sags much more than people realize in these small quads. And I am using approx. AWG20 wire with JST RCY battery connectors.