Another multi-sport watch with a great battery life, the Vertix 2 is a premiere outdoor watch, nice and rugged to take on your adventures. Garmin Enduro 2: Price Comparison 69 Amazon customer reviews 6 days ago · Battery Life on Stand By: Up to 16 days Battery Life Using GPS: 30-42 hours Water Rating: 10 ATM Pros Excellent battery life Updated heart rate sensor 4 days ago · The Lily 2 sports up to five days of battery life and plenty of features common on Garmin’s cheaper watches, including women’s health and cycle tracking, sleep scores, Body Battery (but not Vastly extended battery life through solar charging.Supported Application:GPS. Connectivity technology:GPS. Wireless comm standard:Bluetooth ; Rugged GPS Watch is water-rated to 100 meters and constructed to U.S. military standard 810 for thermal, shock and water resistance Battery life: up to 5 days in smart mode; up to 2 additional weeks in watch mode (hands tell time only) Consider a similar item Garmin Venu, GPS Smartwatch with Bright Touchscreen Display, Features Music, Body Energy Monitoring, Animated Workouts, Pulse Ox Sensor and More, Silver with Dark Gray Band (Renewed) The Garmin Forerunner 745 is a solid choice for a multi-sport watch that offers training insight, though other watches boast a better battery life. TODAY'S BEST DEALS $329.99 Top picks for the best running watch. Best overall: Garmin Forerunner 745 - See at Amazon Best battery life: Fitbit Sense 2 - See at Amazon Not surprisingly, the battery life of the Ambit2 is about twice that of the Ambit2 S: 16 hours versus 8 hours with a 1-second GPS recording interval. But “all else being equal” is seldom the case, so mAh is not the sole determinant in the battery life of a GPS watch. For example, the Polar V800 has a 350 mAH battery, yet its battery life is TvG9.