There is no minimum battery level required for reader alarms* to function. To ensure
alarms are not missed, be sure to charge the reader when you receive the Low Battery
alert.
* Notifications will only be received when alarms are turned on and the sensor is within 33 feet unobstructed of the reading device. You must enable the appropriate settings on your smartphone to receive alarms and alerts, see the FreeStyle Libre 3 User’s Manual for more information.