FB407 Wireless Fitness Tracker User Manual FB407_Product Manual_DRAFT_052016 Fitbit, .
Amazon.com: Cameron Sino Battery for Fitbit Alta Activity, Alta HR PN:Fitbit FB407 45mAh / 0.17Wh : Electronics
Amazon.com: LIONX Battery Replacement for Smartwatch Fit Model Fitbit Alta HR Alta Activity Part Number Fitbit FB407 45mAh / 0.17Wh 3.7v Lithium-Polymer Black Color : Electronics