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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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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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Polar H10 Heart Rate Monitor – ANT +, Bluetooth - Waterproof HR Sensor with Chest Strap - Built-in memory, Software updates - Works with Fitness apps, Cycling computers, Sports and Smart watches:
![Amazon.com: HQRP 4-Pack Lithium Battery Compatible with Polar FT40 FT40M H7 H10 Heart Rate Monitor FT4O FT-40 FT-40M : Electronics Amazon.com: HQRP 4-Pack Lithium Battery Compatible with Polar FT40 FT40M H7 H10 Heart Rate Monitor FT4O FT-40 FT-40M : Electronics](https://m.media-amazon.com/images/I/71Gkex8HmuL._AC_UF350,350_QL80_.jpg)