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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.
Replacing the Battery on the Garmin Premium Heart Rate Monitor | Garmin Customer Support
Garmin HRM-TRI/SWIM Bundle Waterproof heartrate monitors for pool swimming and triathlon at Crutchfield
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