The Water Sensor automatically alerts you when the battery is low. You can also check the battery level in the app under Devices > Water Sensor. The Water Sensor uses a CR2450 Lithium coin cell battery, which should last a few years. The Water Sensor consumes slightly more power and has a shorter battery life if the probes are left submerged underwater constantly; therefore, do not leave the Water Sensor submerged underwater for long periods of time.
- Remove the sensor cover
- Remove the battery (the Water Sensor requires a small Phillips head screwdriver)
- Replace the battery (positive side facing outwards)
- Replace the sensor cover