Fitbit-Charge-2-Battery-Life-Indicator - Fitbit Blog
Fitbit Charge 5 on long-term test: Ergonomics, features, value for money | ZDNET
Amazon.com: Fitbit Versa 4 Health and Fitness Smart Watch (Pink / Rose) with Built-in GPS, 6 Day Battery Life, S & L Bands, Bundle with 3.3foot Charge Cable, Wall Adapter, Screen Protectors