Basically ads is correct, but that's only half the story!
The clue is to look for 'LiPo Safe' when buying ESCs.
That tells you it has a programmable Cut Off voltage
setting to prevent damage to your battery
. Default is usually 3.2V per cell.
Absolute minimum is 3.0V. Below that you risk irreversible damage to the battery
due to chemical changes that can't be reversed.
The alternative is to fit a battery
monitor which can trigger an audio and/or visual alarm to warn you to 'make nearest port best speed' before your battery
is deep discharged, from which it will not recover!
Some ESCs have a programmable function which allows to preset a reduction of the max power to the motor
(instead of a total shut down) to give you the chance to get home before disaster.
PLEASE don't ask me which ones. Check the specs carefully before you buy.
Many current TX/RX sets will tell you on the TX display
when the battery volts
Cheers, Doug 😎