According Polar must be the wind speed and cadence sensors if your battery completely. Although the old sensor from Polar is "recycled" and 3,000 hours per sensor, the whole is really in the frame, but it is annoying if you have just one week of training camp, an important race, etc. in front of him and then stands there with an empty sensor.
But there are remedies, because you can change the batteries themselves. For this you have only a very small screwdriver or a knife to pry the sensor in the center carefully.
 | looks forward to an inside then a board, which you will also need to carefully pry out of the "battery". |
| It is a standard coin cell type CR1632, which you can buy more relatively cheap. |  |
removed The best way now to the upper contact, exchange the battery and sets the upper contact again. Then you have to just put on it nor the board again, the two halves together again and glue endfest with a few drops of super glue or UHU. One should note that one deals very sparingly with the glue to take the sensor to the next battery change apart again without damage.
and production of the refurbished speed sensor is:
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