vívofit Owner's Manual - Replacing the Heart Rate Monitor Battery
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.
Garmin Edge 530 Bike Computer Endurance Bundle with HRM-Dual Heart Rate Monitor. Performance GPS Cycling/Bike Computer, Mapping, Dynamic Performance Monitoring, Popularity Routing, Bluetooth Pairing - Walmart.com
How long do HRM-Tri batteries last? – Chris Worfolk's Blog
Resetting the Heart Rate Chest Strap and Replacing Its Battery