Fitbit's updated Charge 3 will be out on October 7th - The Verge
Fitbit Charge 4 - Review 2020 - PCMag Australia
It's Here! Charge 3: Fitbit's Most Advanced Fitness Tracker Yet
Fitbit Charge 5: Redefining strength
Fitbit Charge 5 Hands-On Review | Healthline
My Charge 3 did this today. Warranty was up three weeks ago. Fitbit had every right to deny to replace it, but 10 minutes with tech support chat and they are shipping
Can you use the Fitbit Charge 3 bands with the Fitbit Charge 4? - OzStraps