Just checked the manual the default cutoff is 3.0v per cell
"QuickTune Example: Let’s say you want to use a 4 cell LiPo
battery. To change the Voltage Cutoff from the default setting
(1 = None) to setting 4 (4 = 12.0 Volt Cutoff), first follow step
1 above by pressing and releasing the MODE button 7 times.
Now press and release the INC button, the LED should show
the current setting of 1. Press and release the INC button 4
times and the LED will move to position 4, indicating that
Voltage Cutoff is now set to 12.0 Volts. Wait 5 seconds and
the ESC returns to normal operation."