1. Polar WearLink® and WearLink® transmitter W.I.N.D.
The average battery lifetime of Polar WearLink® transmitter is 2 years (1h/day, 7days/week of use) and Polar WearLink® transmitter W.I.N.D. battery lifetime is 2 years (3h/day, 7days/week of use). Polar recommends that the transmitter battery be checked by a Polar Service Center if you have your receiver battery replaced.
The following symptoms may be an indication of a battery replacement need:
- The heart rate reading does not appear on the receiver display
- The heart rate reading stays at the same value for a long time or is erratic
- The heart symbol does not blink.
WearLink and WearLink transmitter W.I.N.D. have replaceable batteries. You can also contact an authorized Polar Service Center or the local Polar distributor if you would like the battery to be replaced for you. Please find your closest local Polar distributor here.
Polar recommends that the transmitter battery be replaced by a Polar Service Center during the 2 years' warranty time of the product.
With good care your WearLink and WearLink transmitter W.I.N.D. last longer
- Rinse the transmitter connector and strap with water after every use. Never put the transmitter connector in the washing machine or drier!
- Store the strap and connector separately.
- Wash the strap regularly in a washing machine at 40 ºC/ 104 ºF. The recommended minimum washing frequency is every fifth use. This ensures reliable measurement and maximizes the life span of the transmitter.
- Always dry the transmitter with a towel. Do not blow dry it, for instance. Rough handling may damage the electrodes.
- Store your Polar product in a cool and dry place. When it is wet, avoid wrapping it in a non-breathing material, such as a plastic bag or a sports bag.
For more information on possible sources for transmission disturbance, see Abnormal heart rate readings during the exercise.
2. Polar T31, T31C and T61 Transmitters

The average battery lifetime of Polar T31, T31C and T61 Transmitters is 2500 hours of use. Polar recommends that the transmitter battery be checked by a Polar Service Center if you have your receiver battery replaced. The whole transmitter needs to be replaced in cases where the battery is flat.
The following symptoms may be an indication of a transmitter replacement need:
- The heart rate reading does not appear on the receiver display
- The heart rate reading stays at the same value for long time
- The heart symbol does not blink.
When the battery has run out, contact the authorized Polar Service Center in your area. They sell new transmitters and take care of the old transmitter. Polar recycles used transmitters.
With good care your T31, T31C or T61 transmitter last longer
- Wash the transmitter regularly after the use with a mild soap and water solution. After washing, dry it carefully with a soft towel.
- Never store the transmitter wet. Sweat and moisture on the electrodes can keep the transmitter activated, which shortens the battery lifetime unnecessarily.
- Store your Polar product in a cool and dry place. Do not store it in any kind of non-breathing material, such as a plastic bag or a sports bag, if it is wet.
- Do not bend or stretch the transmitter. This may damage the electrodes.
- Always dry the transmitter with a towel. Rough handling may damage the electrodes.
For more information on possible sources for transmission disturbance, see Abnormal heart rate readings during the exercise.
For further assistance please contact the Service Center at the local Polar distributor.
Please find your closest local Polar distributor here.