If I recall there was some difficulty using that mod with XML’s. Originally, CPFuser download did it with P7’s that have a higher Vf. I used a slightly different method Here see Post 100 for a picture and description of the mod. For 3 cells it used an L78L05 voltage regulator in place of one of the 7135 chips. Another less complicated method uses a Zener diode and resistor. Both methods fix the input voltage of the mcu and disable voltage monitoring.