Same method applies to any garmin sensor.
Garmin 520 speed sensor battery.
Caring for the heart rate monitor.
Cadence is your rate of pedaling or spinning measured by the number of revolutions of the crank arm per minute rpm.
Locate the circular battery cover on the back of the sensor.
If no speed and cadence sensors are paired with the device gps data is used to calculate the speed and distance.
Cadence data from the cadence sensor is always recorded.
Replacing the heart rate monitor battery.
Speed sensor and cadence sensor specifications.
Garmin recommends you secure your bike on a stand while installing the sensor.
Battery type user replaceable cr2032 3 v battery life approximately 12 months 1 hour per day operating temperature range.
Replacing the speed sensor or cadence sensor battery.
Replacing the heart rate monitor battery.
Speed sensor and cadence sensor specifications.
Replacing the speed sensor or cadence sensor battery the led flashes red to indicate a low battery level after two revolutions.
Caring for the heart rate monitor.
A walkthrough of how to change the battery on a garmin speed sensor.
Place and hold the speed sensor on top of the wheel hub.
Pull the strap around the wheel hub and attach it to the hook on the sensor.