The Polar H10 uses a coin cell battery like those found inside watches, which will last for up to 400 hours or more than one ...
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New Polar Grit X2 Pro smartwatch brings all the right upgrades for outdoor enthusiastsThe watch gets up to 10 days of battery life in smartwatch mode and ... with an optional bundle for the Polar H10 heart rate sensor. A few years after Polar launched the Grit X Pro smartwatch ...
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