You will receive transmitter end of battery life alerts on your display device. You should use the transmitter until you receive the message to pair a new transmitter.
The EASIEST Way to Pop Out Your Transmitter to Restart Dexcom G6 Sensor
guess who got the transmitter out without breaking the sensor? : r/dexcom
Dexcom G6 Setup Step 1: Download the apps - Levels Support
How do I replace my Dexcom G6 transmitter?
Sell Dexcom G6 Sensors DME (3 Pack of Sensors) - Two Moms Buy Test Strips
Tool to remove Dexcom G6 transmitter to reuse sensor Dia-way
How do I replace my G6 sensor? – Signos Help Center
App G5 Mobile General FAQ Dexcom, 46% OFF
OUTDATED*** Dexcom G6 Battery Replacement
How do I change my Dexcom G6 sensor?