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Polar’s latest watch promises 40-hour battery life with all features on

Polar’s latest multisport watch promises a battery life that could sate the most dedicated of fitness enthusiasts. The company claims Grit X can run for up to 40 hours on a single charge, and that’s with all of its features activated. With power save options, the Grit X offers up to 100 hours of juice before you’ll need to recharge it.

You might not want to use all of the features at once in any case, but even so, Grit X includes a wide array of tools. Along with the GPS tracker, compass, altimeter and wrist-based heart rate monitor, there’s a Hill Splitter feature, which tracks your uphill and downhill segments with detailed stats.

The Grit X includes route planning and turn-by-turn directions, a new FuelWise assistant that reminds you when it’s time to grab a bite (a bit like Garmin’s Body Battery), weather forecasts, a sleep quality tracker and a trove of other smart coaching options. The watch is pretty tough too, having passed a number of US military-grade tests, including humidity, extreme temperature and drop tests.

The battery is the real selling point, however. For comparison, Garmin’s Fenix 6S lasts for up to 50 hours, but that’s in GPS battery saver mode (it’ll run for up to six hours in GPS mode while you’re listening to music). Getting to use all of the Grit X’s features for almost an entire weekend without recharging might make it attractive to some.

The Grit X is available for $429.95. A number of bands are also on sale as of today, costing between $30 and $50.