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The Fitbit Charge 4 is a tracker released in March 2020. [38] It shares the same form factor as the Charge 3, but includes additional features such as in-built Spotify controls, Active Zone Minutes [39] and Fitbit Pay Support. Charge 4 also has built in GPS, and many of the Charge 3 clock faces return. [40] [promotion?]
The Fitbit Charge 3, a wristband health and fitness tracker introduced in October 2018, was the first device to feature an oxygen saturation (SPO2) sensor; however, as of January 2019, it was non-functional and Fitbit did not provide an implementation timeline. [44] The Fitbit Charge 3 comes with two different-sized bands: small and large.
Stage 3 is called the U-phase or float charge state, the voltage is reduced to a value that is safe to be applied for long periods (weeks) without significantly reducing the lifetime of the battery. During this phase, the charge current decreases gradually to a small residual value that compensates for any self-discharge of the battery.