![Amazon.com : Polar H10 Bluetooth Replacement Heart Rate Sensor (Belt Not Included) : Sports & Outdoors Amazon.com : Polar H10 Bluetooth Replacement Heart Rate Sensor (Belt Not Included) : Sports & Outdoors](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/41jSp8sTPtL._AC_UF1000,1000_QL80_.jpg)
Amazon.com : Polar H10 Bluetooth Replacement Heart Rate Sensor (Belt Not Included) : Sports & Outdoors
![HQRP Battery (4-Pack) Compatible with Polar RS300X Heart Rate Monitor (2 Batteries Compatible with Training Computer + 2 Batteries Compatible with Transmitter Polar WearLink) HQRP Battery (4-Pack) Compatible with Polar RS300X Heart Rate Monitor (2 Batteries Compatible with Training Computer + 2 Batteries Compatible with Transmitter Polar WearLink)](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/71bAP7cFb2L._AC_UF1000,1000_QL80_.jpg)
HQRP Battery (4-Pack) Compatible with Polar RS300X Heart Rate Monitor (2 Batteries Compatible with Training Computer + 2 Batteries Compatible with Transmitter Polar WearLink)
![Polar H10 won't connect unless I remove red rubber washer. Is your battery cover flush? Using CR2025. : r/Polarfitness Polar H10 won't connect unless I remove red rubber washer. Is your battery cover flush? Using CR2025. : r/Polarfitness](https://i.redd.it/kepzklhz0cx81.jpg)