On other forums some guys asked me if I can measure the resistors but it seems they recommand to not measure them on the pcb, as the other circuitry is influencing the result, with the link you provided (I google but couldn't find to many result for ESP wroom with 18650 battery, thank you for finding out that link!!!) some things are clearer now.
What are your suggestions to be able to measure up to 4.2v?
I only have one idea, to swap the R2 resistors with a lower voltage, I have to look over to see what I can find around 68k . Is there a simpler way to be able to measure up to 4.2v ?