Garmin Vivofit a fitness tracker with super-long battery life - Video - CNET
How to Change Garmin Vivofit 4 Battery (and Hack Capacity to Make Longer-Lasting)! - YouTube
Vivofit Battery
Amazon.com: Garmin vivofit jr. 3, Fitness Tracker for Kids, Includes Interactive App Experience, Swim-Friendly, Up To 1-year Battery Life, Digi Camo : Sports & Outdoors