Garmin Speed Sensor Battery Drain

Garmin Speed Sensor Battery Drain: Should I Replace It?

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Due to manufacturing defects, a technical issue,s or any issue, battery drain is a severe problem for any mechanical instrument. As a Gramin Speed Sensor user, it is very important to have your Speed Sensor to the fullest. Not only you but many users have complained that, just after a few hours of inserting a new battery, the Speed Sensor indicates low battery and stops working. That means the batteries are dead due to heavy battery drain. Believe me, this happens with many other users too. 

You may be thinking of adding new batteries every day. But if you imagine, that is a tiresome and money-draining task. And some of you may be thinking of replacing it with a new one. That is not a bad idea at all. But before that, we will discuss why your speed sensor battery is draining a lot. Maybe fixing some minor problems will help with this battery drain problem.

Speed Sensor includes a magnetometer, equivalent to the accelerometer, which measures the three-dimensional components of the environmental magnetic field. The magnetometer measures the rotation of a wheel within the magnet field of the surrounding earth. It is possible that there isn’t any serious problem rather than a bad connection with the magnetometer. Changing the magnetometer may seem beneficial. Again, if you consider, rather than changing the magnetometer, buying a new speed sensor will be relatively easy and efficient.

Just like this, let’s start the discussion about should you replace your speed sensor or not.

Reasons behind The Garmin Speed Sensor Battery Drain

Garmin Speed Sensor Battery Drain Replace

There could be many reasons behind the drainage of your speed sensor battery. Within a few moments of reading through the article, you will get to know the causes that may be responsible for your battery drainage. These steps will also help you to fix the battery drainage problem by yourself. 

1. 100% Bluetooth Activity:

Of course, the device will be connected with a speedometer via Bluetooth. But when you are not using the speed sensor, if the devices are still connected or still on, it may drain the battery. This is a very common mistake. Make sure you turn off the connectivity when not using it. 

2. GPS Tracking:

Unlike Bluetooth, this feature is very essential nowadays. Most likely we will even use it to go to the nearest grocery shop. But GPS may lead significantly to a significant drain of batteries, which is why GPS monitoring is activated only during operations or navigation. We would highly suggest not keeping it turn on unless you need it. 

3. Bad Battery Quality:

One battery is used for the Garmin Speed Sensor. After two revolutions, the LED flashes red to display a low battery level. The sensor on the back. If your sensor battery is draining heavily bad battery quality can be a reason. You should consider a different brand. 

4. Bad Battery Connection:

Believe it or not, sometimes due to a bad battery connection, the battery drains. As the sensor will rotate, the battery can be misplaced. Just fit the battery to the right place. It might be helpful.

5. Dead Cadence Sensor:

Dead Cadence Sensor

The Duotrap sensor can need to be replaced because of a dead cadence sensor. You can hear it ticking, but no light is passed, and it can no longer catch up with 510.

6. Due to Moisture: 

It is possible that your speed sensor must have drowned or have got wet. Just try to dry it up using a hairdryer or place it in a sack of rice. It will dry up the water the problem may get solved. 

7. Resetting the System:

Sometimes due to faulty settings, the battery starts draining faster than usual. Try resetting the sensor and see if the default setting helps you anyhow. 

8. Old Version of Software: 

Sometimes, due to old version software, speed sensors lack the potential of work they might need to be. Being turn on, but not working lead the sensor battery to drain. Try and update the new software.

Above mentioned facts are responsible for battery drainage. Try the solves that have been mentioned. If any of these solutions do not work, then there is no other way but to replace your Garmin Speed Sensor.

Also check the guide about garmin forerunner won’t turn

FAQs about Replacing Garmin Speed Sensor

There should always be some consideration before you buy anything. When it comes to Speed sensors you have to be very careful. Along with that check this important faq which will help you to understand it better.

  • Calibrate my Garmin speed sensor?

Hold the touch screen. 

Choose Setup > Sensors > Speed / Cadence > Wheel Size. 

Choose an option: Auto is chosen for automated wheel size calibration and the speed sensor calibration. Pick Manual to manually calibrate the speed sensor and enter your wheel size

  • Is Garmin a more reliable speed tracker than GPS? 

Wheel sensor is reliable so a gross error can exist if it’s not properly calibrated. It would be both reliable and precise if it is adjusted correctly. GPS is less reliable but does not require a configuration of the user.

  • Garmin cadence sensor not working?

Until the Led flashes, the CR2032 coin cell battery should be disconnected and replaced by a new one. Keep the sensor battery off for 30 seconds before it is replaced. Ensure that the Garmin system is coupled with a sensor on a personal computer using the Garmin Express program up to date. 

  • How to reset the Garmin speed/cadence sensor?

When doing a Garmin speed rating sensor reset, pick Bike settings from the list that emerges, first select the ANT + SPD/CAD reset button on GPC 10 to reset the red and green light blinking button.


Battery draining is very unexpected. It could frustrate you a lot. Not getting the info you need on time is very disappointing. Speed sensors are really helpful when cycling. It also helps with GPS tracking.

Above mentioned steps will help you to fix the battery drainage problem if there is any issue like that. Otherwise, you have to replace the Sensor and buy a new one. Let’s just hope your sensor does not have any internal problems.

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