Garmin Edge 840 Solar Owners Manual - Page 76
Replacing the Cadence Sensor Battery
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Replacing the Cadence Sensor Battery The device uses one CR2032 battery. The LED flashes red to indicate a low battery level after two revolutions. 1 Locate the circular battery cover on the back of the sensor. 2 Twist the cover counter-clockwise until the marker points to unlocked and the cover is loose enough to remove. 3 Remove the cover and the battery . 4 Wait 30 seconds. 5 Insert the new battery into the cover, observing polarity. NOTE: Do not damage or lose the O-ring gasket. 6 Twist the cover clockwise until the marker points to locked. NOTE: The LED 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. 70 Device Information