This is my third Polar H10 dead in ten months : r/Polarfitness
Polar H10 Sensor Battery Kit | by Polar | Price: R 129,9 | PLU 1134150 | Sportsmans Warehouse
Maxell CR2025 - 5 Premium Batteries
Amazon.com: Afoosoo CR2025 3V Lithium Coin Battery – 5 Pack CR 2025 Battery for Car Remote Control Key Fob Mercedes Benz MB Fitbit Zip Watch Garmin Vivofit Jr 3 Thermometer Garage Door