Original Size Battery 3.7v 2400mah For Garmin Astro System Dc20 Dc20 Dc30 Dc40 Dog Tracking Dc 20 010-10806-20 361-00029-00 - Mobile Phone Batteries - AliExpress
HQRP 2-Pack Extended Battery Pack Compatible with Garmin Astro System DC40 DC-40 GPS Dog Tracking System Collar Transmitter 010-11484-00 - Walmart.com
Aftermarket Replacement Battery for Garmin DC30 and DC40 | Double U Hunting Supply
Garmin Astro System DC20 DC20 DC30 DC40 Do 2200mAh Replacement Battery: BatteryClerk.com Dog Collar