Up to 40 hours with GPS, plus some new features to help you recover.
Polar Vantage V2 Sports Watch announced with long battery life - Android Community
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SUUNTO Vertical GPS Sports Watch, Activity Tracker w/ Dual-band GNSS & Offline Maps, Up to 60-Day Battery Life, Supports 95+ Sports, 24/7 Health Care, Smart Watch For Men & Women, Solar Charging
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Polar Vantage V2 Sports Watch announced with long battery life - Android Community
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Polar Grit X