Jacek Rutkowski wrote: This converter gives a stable 1.5V until the very end.
Well, not until the very end.
mipix wrote: I`ve written this before, but I`ll say it again:
In the cell voltage range of 4.20 V ... 3.15 V, the converter output is 1.51 V
In the cell voltage range of 3.14 V ... 2.80 V, the converter output is 1.10 V
Below the voltage of 2.80 V on the cell, the converter output is 0 V
For accurate measurement, a resistor and a clock are not enough. You need to make more effort or use a better capacity tester.