The Garmin Swim 2 watch boasts a Garmin Swim 2 Smart Watch Battery life of 7 days in Smart Mode, approximately 60-72 hours for pool swimming with optical heart rate monitoring, and approximately 12-13 hours for open water GPS with optical heart rate monitoring. Actual battery life drops significantly, usually not due to a faulty battery, but rather because several “hidden power drains” are constantly running.
First, reduce the backlight. Backlight standby time is the most easily overlooked power drain on the Swim 2. Minimize the backlight timeout, only illuminating it when pressing buttons; this will significantly improve theGarmin Swim 2 Smart Watch Battery life in Smart Mode. Second, turn off Bluetooth. If you don’t need phone notifications all day, turn off Bluetooth Wi-Fi. The watch will stop constantly searching and syncing, which is one of the primary power-saving actions listed by the manufacturer. Third, turn off the optical heart rate sensor. The heart rate sensor is the second largest power drain on the Swim 2. When not swimming or training, turning off the wrist-based optical heart rate monitor significantly improves the Garmin Swim 2 Smart Watch Batterylife. The trade-off is that “Weekly Heat Time” and calorie estimation will lose their accuracy; weigh the pros and cons yourself.
Another low-cost, high-return approach is to replace the connect IQ watch face, which refreshes every second, with a static watch face without a second hand, while limiting the number of phone notifications. GPS is essential for swimming and open water swimming, but in pool mode, if you don’t need real-time pace vibration alerts, reducing the data refresh rate can also free up extra time.
The Garmin Swim 2’s battery is excellent; whether you use it as an “all-day smartwatch” or a “dedicated training watch,” the Garmin Swim 2 Smart Watch Batterylife can differ by up to 200%.
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