Try the monoprice motion and temperature sensor, it’s got a great battery life is reasonably accurate: [RELEASE] Monoprice/Linear/GoControl WAPIRZ-1 Motion Sensor with Temperature and Battery Device Type (Updated)
Alternative you could try the Monoprice or ZooZ 4 in 1 sensor, it’s got more features and a more accurate sensor (0.1 degrees) but a shorter battery life: [RELEASE] Official Monoprice 4 in 1 Motion Sensor with Temperature, Humidity, Light, Battery and Tamper Notifications Device Handler