Support: Battery Replacement on a vívofit® jr. 3 - YouTube
Tutorial - vívofit jr. 3 Battery Replacement - YouTube
Amazon.com: OenFoto Compatible Vivofit 3 Vivofit JR Bands with Metal Secure Watch Clasp, Silicone Replacement Bands for Vivofit 3 JR- Black : Electronics
Amazon.com: E ECSEM Large Replacement Bands and Straps for Garmin Vivofit JR & Vivofit JR.2 & Vivofit 3, [fits 5.5~8.5 inch Wrists] for 5 Years Kids or Older Children, Black/Slate/Red : Electronics