The battery lasts for about 1 year with typical use.
Typical use is defined as:
- 18 hours of the Sensor being armed a day
- 1 Motion or Smoke Trip Event per day
- The Sensor is synced to the Relay Station
When the Sensor is powered on but not synced to a Relay Station, then it will stay on longer looking for a connection to a Relay Station. In this state, the Sensor can burn through the batteries much faster.