Original size Battery 3.7V 2400mah for GARMIN Astro System DC20 DC20 DC30 DC40 Dog Tracking DC 20 010-10806-20 361-00029-00 - AliExpress
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Amazon.com: Synergy Digital Dog Collar Battery, Compatible with Garmin DC30 Astro Dog Tracking System Dog Collar, (Li-Ion, 3.7V, 2600 mAh) Ultra High Capacity, Replacement for Garmin 010-10806-00 Battery : Health & Household
Amazon.com: VI VINTRONS 361-00029-00 Battery Replacement for Garmin DC20, DC30, DC40, Astro System DC20, : Electronics
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Garmin - Astro System DC30 Battery | Complete Battery Source
TWO Battery for Garmin Astro System DC-20 DC-30 DC-40 GPS Dog Tracking System | eBay