300mAh 361-00034-02, FLPB342735-P1 Battery Replacement for Garmin Fenix 3 and Fenix 3 HR Fitness GPS Smartwatch with Installation Tools - Newegg.com
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Amazon.com: Synergy Digital Smartwatch Battery, Works with Garmin Fenix 3 HR Smartwatch, (Li-Pol, 3.7V, 300mAh) Ultra High Capacity, Compatible with Garmin 361-00034-02 Battery : Electronics