X20/X20S and Ethos v1.0.11 User Manual
Battery
The Battery section is for calibrating the radio batteries and setting the alarm thresholds.
Main Voltage
This is the nominal battery voltage. The default is 8.4V for a charged 2 cell lithium battery.
Low Voltage
This is the alarm threshold voltage. The default is 7.2V.
A speech 'Radio Battery is Low' Alert will be given when Main Battery Check is ON in System
/ Alerts and the main radio battery is below the threshold set here.
Display voltage range
These settings set the range of the graphical battery display in the top right of the screen.
The default range limits for the built-in Li-Ion battery are 6.4 and 8.4V. Many pilots increase
the bottom sensing voltage to trigger the low TX voltage alert earlier and prevent over
discharging their TX battery.
If the battery is changed to a different type, then the limits must be set appropriately.
RTC voltage
Shows the voltage of RTC (Real Time Clock) battery in the radio. The voltage is 3.0v for a
new battery. If the voltage is below 2.7v please replace the battery inside the radio to
ensure the clock runs properly.
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