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HQRP 4-Pack Lithium Battery Compatible with Polar FT40 FT40M H7 H10 Heart Rate Monitor FT4O FT-40 FT-40M + Coaster : Electronics - Amazon.com
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ProDive Battery Kit for Polar FT80, FT60, FT40, FA20, FT1, FT2 RCX3 Sports Watch, Spare Service Set : Amazon.co.uk: Sports & Outdoors
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