Sports
How to Replace the Battery in a Polar T31 HRM Chest Strap
The Polar T31 chest strap is sealed, so battery replacement is not a simple home job. Test the strap first, then choose service or a replacement transmitter.
Sports
The Polar T31 chest strap is sealed, so battery replacement is not a simple home job. Test the strap first, then choose service or a replacement transmitter.