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.
Dexcom G6 Transmitter Save Restart Sensor By removing Transmitter
Dexcom G6 Real-Time CGM System Now Available To All Clients, 55% OFF
How do I replace my Dexcom G6 transmitter?
How do I replace my Dexcom G6 transmitter?
G6 transmitter battery replacement – See My CGM
Dexcom G6 — How to Replace Your Transmitter
How do I replace my Dexcom G6 transmitter?
Why isn't my transmitter working and/or why is my Dexcom Continuous Glucose Monitoring (CGM) System telling me to pair a new transmitter?
Hot-swapping” Dexcom G6 Transmitter - T1D Tech & Daily Management Support - JDRF TypeOneNation Community Forum
Reset G5/G6 Transmitters – See My CGM