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
Garmin Forerunner 235 review | TechRadar
Amazon.com: cs battery Replacement Battery for Garmin Forerunner 220 225 235 630 735XT Approach g10,fits Part No 361-00072-10 361-00086-00 : Electronics