Tutorial - Changing the battery on a Garmin Heart Rate Monitor - YouTube
vívofit 3 - Replacing the Battery
Resetting the Heart Rate Chest Strap and Replacing Its Battery
Amazon.com: Band for Garmin Forerunner 55, Quick Release Band Replacement for Garmin Forerunner 158 / Forerunner 55 (No Tracker, Replacement Bands Only) : Electronics
My Garmin Device Will Not Pair or Display Data From My Chest Heart Rate Monitor | Garmin Customer Support