Garmin Fenix 3 - Garmin: Replacing the Battery in your Heart Rate Monitor ( HRM) The CR2032 batteries in your HRM-Run, HRM-Swim or HRM-Tri straps will last approximately 18 months, depending on use.
vívoactive - Replacing the Heart Rate Monitor Battery
Garmin HR Strap Battery Replacement - YouTube
Garmin HRM-Pro Review - OneManEngine
HRM-Pro-battery-replacement - OneManEngine
Battery Replacement Instructions for Premium Feature HRM Straps | Garmin Customer Support
Amazon.com : Garmin HRM-Pro, Premium Heart Rate Strap, Real-Time Heart Rate Data and Running Dynamics Black Bundle with 5 Extra Batteries (6 Items) : Sports & Outdoors
vívofit Owner's Manual - Replacing the Heart Rate Monitor Battery