Garmin Forerunner 70
It runs 23 h on GPS only and weighs 40 g. Garmin lists no open-water swim metrics or multisport profile; the Forerunner 570 has both.
What the maker states
| GPS battery | 23 h, GPS only |
|---|---|
| Smartwatch battery | 13 days, 5 days with always-on display |
| Weight | 40 g |
| Case size | 42.6 mm |
| Water rating | 5 ATM |
| Display | AMOLED, 1.2 in, 390 x 390 |
| Satellite systems | GPS, GLONASS, Galileo |
| Heart rate sensor | Garmin wrist optical heart rate sensor |
| External sensors | ANT+, Bluetooth |
| Training metrics | Training Readiness, Training Status, HRV Status, VO2 Max, running power, race predictor |
| App | Garmin Connect |