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polar rs300x battery type, HQRP Battery (4-Pack) compatible with Polar Rate Monitor (2 Batteries Training Computer + 2 Batteries for Transmitter Polar WearLink) + Coaster -, Amazon.com : HQRP Battery (4-Pack) Compatible with Polar RS300X Heart Rate Monitor Batteries Compatible with Training Computer + Batteries Compatible with Transmitter Polar WearLink) : Sports & Outdoors