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How to Replace the Battery in a Polar T31 HRM Chest Strap

Olivia Prete
· · Updated Jan 16, 2026 · 2 min read
The Polar T31 Heart Rate Monitor is a tool for athletes to gauge how hard their heart is working while exercising. Using this information, they can also calculate how many calories they've burned. These devices have 2,500 hours of battery life, an might require a new battery at some point during its life.

Polar welds the case shut to protect it, so you can't change the battery yourself. You must have Polar fix it for you.

 

4 Steps To Replace The Battery İn A Polar T31 Hrm Chest Strap

Battery in a Polar T31 HRM Chest Strap

 

1. Make Sure The Battery İs Actually Dead

Occasionally another problem, such as water getting into the transmitter, keeps it from working. Place the monitor in a cool, dry place and check it later to make sure it's the battery.

 

2. Locate A Polar Dealer İn Your Area

Polar maintains a list on its website of authorized dealers all over the world.

 

3. Bring Or Send Your T31 To A Polar Dealer

Explain that you think your battery is dead. The company will test the device and let you know whether or not you need a new battery.

 

4. Purchase Your New Transmitter

The Polar distributor can set the transmitter in the chest strap for you. Polar sells these for $45, but depending on your warranty you might get it cheaper.

 

Tips & Warnings Clean your transmitter and store it in a cool place to increase the battery life.
 

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How to Replace the Battery in a Polar T31 HRM Chest Strap

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Written by

Olivia Prete

For the past 5 years, she has been sharing her thoughts and experiences through her blog, covering topics ranging from personal development to pop culture. Olivia's writing is honest, relatable, and always thought-provoking.

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