Synergy Digital Smartwatch Battery, Works with Garmin Forerunner 225 Smartwatch, (Li-Pol, 3.7V, 180mAh) Ultra High Capacity, Compatible with Garmin 361-00072-10, 361-00086-00 Battery - Walmart.com
New 180mAh Battery For Garmin Forerunner 225 / 235 / 620 / 625 / 735XT GPS Watch | eBay