The most common Fitbit problems and how to fix them - Android Authority
Amazon.com: CAVN Charger Dock Compatible with Fitbit Charge 4 / Charge 4 SE (Not for Charge 3), Aluminum Charger Dock Replacement Charging Stand Station Cradle Base with USB Cable for Charge 4
Fitbit display screen black and not working or turning on? Let's fix it! - MyHealthyApple
Why Won't My Fitbit Charge? 5 Ways to Fix Your Fitbit
What to do with Fitbit Alta HR that no longer charges – The Droid Guy
The most common Fitbit problems and how to fix them - Android Authority