My XG 11MV uses a three-cell pack rather than a two-cell. The default setting on it is 9.0V. When the transmitter was new, I ran a discharge curve on the battery as the poly pack LiFe configuration was new to me. Based on the curve, I bumped the alarm up to 9.5V. The transmitter is now two years old and the alarm point had to be lowered to the default 9.0 as the overall battery voltage has declined with age.
There is nothing wrong with increasing the alarm point when the battery is new. In time you will probably use the default setting. The low voltage setting is indicated by the vertical line on the INFO page TX voltage graph. There is an audio alarm when the voltage drops below the setting. The only way to turn it off is to reset the alarm point and turn the transmitter off.
Allan