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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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Amazon.com: Polar Grit X Pro - GPS Multisport Smartwatch - Military Durability, Sapphire Glass, Wrist-Based Heart Rate, Long Battery Life, Navigation - Mossy Oak Bottomland Edition : Electronics
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Amazon.com: HQRP 10 Pack Battery Compatible with Polar FT4, FT4F, FT7, FT7M Heart Rate Monitor Training Computer : Health & Household
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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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