Use the guide below to find the sensor that matches yours and follow the instructions.
You can order replacement batteries in our online battery store at https://billy-care.myshopify.com/
Multipurpose Sensor (2016 model)
- Remove sensor cover.
- Lever battery out of sensor.
- Loosely place new CR-2450 battery in sensor, then press down on battery until it securely 'clicks' into place.
- Replace cover making sure that the line on outside of cover is on the correct side.
Multipurpose Sensor (2019 model)
- Slide white cover away from flat/magnetic edge of sensor.
- Lever battery out of sensor.
- Loosely place new CR-2450 battery in sensor, then press down on battery until it securely 'clicks' into place.
- Replace cover by sliding it back onto sensor.