Amazon.com: Garmin Forerunner 55, GPS Running Watch with Daily Suggested Workouts, Up to 2 Weeks of Battery Life, Aqua & 010-12883-00 HRM-Dual Heart Rate Monitor, Black : Electronics
Garmin HR Strap Battery Replacement - YouTube
Amazon.com: Garmin Forerunner 55, GPS Running Watch with Daily Suggested Workouts, Up to 2 Weeks of Battery Life, Black & 010-12883-00 HRM-Dual Heart Rate Monitor : Electronics
HRM-Pro Plus Owner's Manual - Replacing the Heart Rate Monitor Battery
Tutorial - HRM-Pro Plus: Replacing the Battery - YouTube
Forerunner 920XT - Replacing the HRM-Run Battery