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50k

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    Battery Life Good for 50k Run? Chest Strap + iPhone + watch

    Hey all, I've got a 38mm series 2. I know that if I'm only using that I'd have no shot it lasting for a full 50k ultra run. I'm curious if I use my chest strap heart rate sensor and carry my phone with me how much longer will the watch last? With the chest strap it wont need to use the internal...