[RELEASE] Enhanced ZooZ 4 in 1 Sensor (ZSE40 v1/v2/v3) Device Handler with Temperature, Humidity, Motion and Luminescence Sensor with Lux Reporting

You may want to try using Li Ion batteries, they have a much better voltage discharge curve and last much longer than alkaline batteries.

E.g.

https://www.amazon.com/Energizer-Lithium-1-5V-Energy-Battery/dp/B001INHELQ

NOTE These are NOT rechargeable batteries, do NOT try to recharge them as they may explode if you do so. These are one use and throw like Alkaline batteries. See this post for more details on Li Ion vs Alkaline.