Each sensor in the Billy kit needs one 3v lithium battery. Use the guide below to find the right size battery for your sensor.
You can order replacement batteries in our online battery store at https://billy-care.myshopify.com/
On average, the batteries in a Billy sensor will need to be replaced every 6 months. This can vary depending on the brand of battery used. We recommend that you use Panasonic or Lisun batteries as we’ve found they last longer in the sensors, but don't worry, other brands still work.
| Sensor | Required Battery |
|---|---|
 |
CR2
|
 |
CR2450
|
 |
CR2477
|
 |
CR2450
|
For battery change instructions, please visit our help centre articles here: