Amazon.com: Garmin vivofit 3 Activity Tracker, Regular fit - White : Electronics
vívofit Owner's Manual - Replacing the vívofit Device Batteries
vívofit jr. 3 - Replacing the Battery
Garmin Vivofit review: Long battery life in a fitness band, no charger needed - CNET
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
vívofit Owner's Manual - Replacing the vívofit Device Batteries
Garmin's Vivosmart 4 combines pulse-ox and a week of battery life for $129 | Ars Technica