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what kind of battery for polar heart rate monitor, Amazon.com: HQRP 4-Pack Battery for Polar s3 Sensor, WearLink, S210 S610 Heart Rate Monitor : Health & Household, Amazon.com: HQRP 4-Pack Lithium Compatible with Polar FT40 FT40M H7 H10 Rate Monitor FT4O FT-40 FT-40M : Electronics