Amazon.com: Synergy Digital Smartwatch Battery, Works with Garmin Forerunner 235 Smartwatch, (Li-Pol, 3.7V, 180mAh) Ultra High Capacity, Compatible with Garmin 361-00072-10, 361-00086-00 Battery : Electronics
100% Original Battery 361-00086-00 For Garmin Forerunner 225 235 620 630 735xt Gps Sports Watch 3.8v Rechargeable Replacement - Mobile Phone Batteries - AliExpress
Original Replacement Battery 361-00086-00 For Garmin Forerunner 235 220 225 630 645 Vivoactive 4
App, battery life and verdict - Garmin Forerunner 235 review - Page 3 | TechRadar