Looking at the manual of the Hitec X4 smart charger the lowest you can discharge a Life cell is 2 volts per cell or higher... that means to me that the 2V can be adjusted upwards.
BUT not less than 2V for safety's sake as set up by Hitec. Also you can select from 1 cell upwards.......to the max listed in the charger specs..which is 6 cells and that is because the balance boards are designed to accept that number and that is adjusted by the user.. Never charge or discharge lithium based batteries without using your balance board.