voltage warning mt4s

anyone know what the warning is low voltage 3.8 as soon as i unplug the battery on the crawler?
i have a 2s lipo in the tx which is fully charged and 8.3v showing on the display.
i could hear the beeps when unplugging the battery before,but only noticed the warning on the display today.!

VRC 468x90 voltage warning mt4s

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