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Polar H9 Heart Rate Sensor Chest Strap Supports ANT+ And GymLink | Gadget Explained Reviews Gadgets | Electronics | Tech
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Amazon.com : HQRP Battery (4-Pack) Compatible with Polar RS300X Heart Rate Monitor (2 Batteries Compatible with Training Computer + 2 Batteries Compatible with Transmitter Polar WearLink) : Sports & Outdoors
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Amazon.com: HQRP 4-Pack Lithium Battery Compatible with Polar FT40 FT40M H7 H10 Heart Rate Monitor FT4O FT-40 FT-40M : Electronics
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Polar H10 won't connect unless I remove red rubber washer. Is your battery cover flush? Using CR2025. : r/Polarfitness
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