The Speed Sensor battery should last at least one year under normal use. If you need to replace the battery, the correct type is a CR2032, 3V coin cell battery.
To check battery level spin the wheel two revolutions. If the LED (a) on the Speed Sensor body flashes red, the battery level is low.
How to remove and replace the battery:
- Remove the Speed Sensor from wheel using a 2mm hex.
- Use a coin in the cover slot (b) and turn cover counter-clockwise until the cover dash (c) aligns with the unlock symbol (d) and is released.
If necessary, carefully use a tiny thin blade screw driver placed under the lip of the cover to lift it up. Use only very light force to avoid damaging the cover, o-ring seal (e), or cover. Do not twist the screw driver.
- Remove the battery from the cover. Wait 30 seconds.
- Insert the new battery (g) with the positive “+” symbol on the battery facing up. Note the “-” marking (h) in the cover, the battery’s marking must face it. Locate the small tabs (f) and tilt the battery slightly under these tabs before pressing it in.
- To reinstall in unit housing, align the cover dash (c) with the unlock symbol (d) and insert the cover with new battery.
Use the coin with light downward pressure and turn the battery door clockwise until the cover dash aligned with the as shown “LOCKED". Check the battery door to make sure it is flat against the housing and not tilted exposing or pinching the orange o-ring seal. Release the cover and re-try.
NOTE: The LED (a) flashes red and green for a few seconds after battery replacement. When the LED flashes green and then stops flashing, the device is active and ready to send data.
The Speed Sensor user manual can be downloaded here: 134946 REV 1 CD II Wheel Sensor.pdf