So, it seems I (amateurlishly) replaced a Forerunner 245 battery : r/Garmin
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Garmin Forerunner 10 Battery Replacement - iFixit Repair Guide
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Garmin Forerunner 10/15 Cheap Battery Replacement [Guide] - YouTube
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High Quality PD2032C1/LIR2032H 200mAh Replacement Battery For Garmin Forerunner 10 / Forerunner 15 + Free Tools - AliExpress
![Garmin Forerunner 10/15 Cheap Battery Replacement [Guide] - YouTube](https://i.ytimg.com/vi/puv_eayXnEA/hq720.jpg?sqp=-oaymwEhCK4FEIIDSFryq4qpAxMIARUAAAAAGAElAADIQj0AgKJD&rs=AOn4CLAYqmR5puJvk5m7gEcCpUx7rNxpbw "Garmin Forerunner 10/15 Cheap Battery Replacement [Guide] - YouTube")
Garmin Forerunner 10/15 Cheap Battery Replacement [Guide] - YouTube
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High Quality PD2032C1/LIR2032H 200mAh Replacement Battery For Garmin Forerunner 10 / Forerunner 15 + Free Tools - AliExpress
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![Garmin Forerunner 10/15 Cheap Battery Replacement [Guide] - YouTube](https://i.ytimg.com/vi/pCW-VY_vxAw/sddefault.jpg "Garmin Forerunner 10/15 Cheap Battery Replacement [Guide] - YouTube")
Garmin Forerunner 10/15 Cheap Battery Replacement [Guide] - YouTube
