Low Voltage Cutout
The low voltage cutout circuit is designed to fold back the current limit when the battery voltage drops below a predetermined level.
The circuit consists of a voltage divider, a diode, and the comparator built into the PWM chip. When the voltage at the junction of the diode and R6 reaches about 3.8v, the diode starts to conduct and pulls down the input to the comparator, reducing the PWM duty cycle.
The resistors that make up the divider were difficult to read on my controller, and I was too lazy to unsolder them to measure the values.
I swear one of them looks like 104, which would be 100K, but that value wouldn't work against the 5.1k to get the right cutoff voltage.
If you snipped the resistor that has the switch across it, and put a potentiometer where the switch is, you could make the LVC adjustable.
I don't have known tested values for this resistance, so could only guess at this point.