Replacing the Battery on the Garmin Premium Heart Rate Monitor | Garmin Customer Support
thegearlife - Garmin HRM-tri In-Depth Review
Garmin HRM-PRO Heart Rate Strap In-Depth Review
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HRM-Pro Owners Manual - Replacing the Heart Rate Monitor Battery
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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.