↓ Skip to main content
SENS motion - Discrete Wearable Activity Sensor for Healthcare and Research

Battery life

We are currently updating our support articles and some info may be outdated. Read release notes here.

Background
#

The sensor’s battery level is updated when the sensor has made contact with the SENS motion sync app. For more information on data transfer see the article Transferring data from sensor.

The battery in the sensor is not rechargeable and therefore the sensor must be returned to SENS Innovation when the sensor battery has run out of power. Within the period of use, the battery can last for 120-130 days when activated and 2 years in off mode.

The sensor overview displays comprehensive battery information to help you monitor sensor health.

Sensor overview with battery information

Each sensor shows:

  • Battery voltage – The current voltage reading from the sensor (when hovering over the icon)
  • Estimated days left – A calculation of how many days of battery life remain based on the sensor’s runtime and usage patterns
Battery icon with voltage on hover

What you need to know: The estimated days left is calculated based on how long the sensor has been active and its current battery voltage. This helps you plan ahead for battery replacements and ensures you don’t lose data due to dead batteries.

How to use it: Look for the battery icon and information under each sensor in the Sensors section. The estimated days left will help you identify sensors that need attention soon. To see battery voltage, hover the mouse cursor over the battery icon.

Battery lifetime estimation
#

The system calculates and displays estimated battery lifetime for each sensor.

What you need to know: The estimated battery lifetime shows how many days are left before the sensor’s battery is expected to run out. This calculation is based on:

  • How long the sensor has been active
  • The current battery voltage
  • Expected battery consumption patterns

Sensor batteries are typically supported for 120 days. After this period, sensors may stop working at any moment.

How to use it: Monitor the “Est. X days left” indicator in the sensor overview. When this number gets low (especially below 10 days), do not use the sensor for any measurements meant to run for longer.

NOTE: It is always recommended that the sensor’s battery level is updated before the sensor is attached to a participant. This ensures that there is enough battery for the sensor to measure the desired period.

If the sensor has not been near the SENS motion app in the last 10 days, the battery status will change to a grey question mark. As the sensor will always use some power, it is therefore not possible to say exactly how much battery is left on the sensor. It is therefore recommended that the SENS motion app is opened near the sensor to measure the battery level and see if the sensor is still functional.