If your Fitbit Charge HR isn't working quite ... Connect the Fitbit's power cable (which must be plugged into a power source). 2. Press and hold the button for two seconds. 3.

Fitbit models like the Ace and the Alta series use a charging cable that clips onto the back of the tracker. The Blaze must be removed from its wristband and set into a charging cradle.

It's such a simple charging mechanism and the same charger across all versions of the Sense and the Versa, so if you upgrade from these models, you'll have a spare cable. The Fitbit Sense 2 is water ...