Amazon.com: Garmin vivofit jr. 3, Fitness Tracker for Kids, Includes Interactive App Experience, Swim-Friendly, Up To 1-year Battery Life, Blue Stars : Sports & Outdoors
vívofit jr. 3 Owners Manual - Replacing the Battery
Replacing the Batteries
Amazon.com: Garmin vívofit 4 activity tracker with 1+ year battery life and color display. Large, Black. 010-01847-03 : Sports & Outdoors