Wrist unit
The estimated average battery life of the wrist unit is 2 years in normal use (2h/ day, 7 days a week). Note also that excessive use of the backlight and the alarm signals will use the battery more rapidly. Do not open the Polar wrist unit yourself. To ensure the water resistance properties and the use of qualified components, the wrist unit battery should be replaced only by an authorized Polar Service Center. At the same time a full periodic check of the Polar heart rate monitor will be done.
Battery Replacement for Speed Sensor
The estimated average battery life of the speed sensor is 2500 hours of use. We highly recommend you send the speed sensor to an authorized Polar Service Center for battery replacement, where the unit is tested after the battery has been replaced. However, if you prefer changing the battery yourself, please follow these instructions carefully:
Detach the sensor from your bicycle.
1.Open the sensor by removing the two small screws, counter- clockwise, with a small screwdriver.
2.Lift the case off carefully. Hold the sensor cover upwards so that the PCBA (printed circuit board assembled) stays in the case.
3.Remove the PCBA carefully.
4.Press the battery holder gently. Release a hook of the holder from the opposite side of the PCBA and lift the holder upwards. Remove the old battery.
5.Insert a new battery with the plus (+) side facing up and press the battery housing gently so that it is attached to the PCBA at all corners.
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