Polar H10 won't connect unless I remove red rubber washer. Is your battery cover flush? Using CR2025. : r/Polarfitness
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Polar H10 not picking up HR. tried cleaning. new battery. repairing. HELP😭😭 : r/Polarfitness
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Amazon.com: HQRP 3-Pack Lithium Battery Compatible with Polar Fs2, F11, F55, A2, S710 Heart Rate Monitor : Sports & Outdoors
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Polar H10 User manual
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Polar H10 review: A tried and tested heart rate chest strap
