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.
Battery Replacement Instructions for Premium Feature HRM Straps | Garmin Customer Support
HRM-Pro-battery-replacement - OneManEngine
Garmin HRM-Tri and Garmin HRM-Swim, new sensors
How long do HRM-Tri batteries last? – Chris Worfolk's Blog
Garmin HRM-DUAL Heart Rate Strap In-Depth Review | DC Rainmaker
thegearlife - Garmin HRM-tri In-Depth Review
Garmin HRM-PRO Heart Rate Strap In-Depth Review
How to change battery for Garmin HRM-tri - YouTube
Tutorial - Changing the battery on a Garmin Heart Rate Monitor - YouTube
vívoactive - Replacing the Heart Rate Monitor Battery
Garmin HRM Tri Failure mode (after battery replacement) - YouTube
Garmin HRM-Pro vs HRM-Tri vs HRM-Run vs HRM-Dual vs Wahoo Tickr X Compared – What's changed and is the HRM-Pro the best heart rate monitor for Garmin
Garmin HRM-Tri™ Heart Rate Monitor - Walmart.com
HRM-Pro Plus Owners Manual - Replacing the Heart Rate Monitor Battery
Support - Changing the battery on a Garmin Heart Rate Monitor - YouTube