This mod transforms the Sonoff Zigbee Temperature & Humidity Sensor by replacing its original coin cell battery with a reliable rechargeable AA battery pack. A custom 3D-printed enclosure keeps everything neat, secure, and durable. I made this modification because the original coin cell batteries lasted about a month, and with these rechargeable AA batteries, I believe it will last much longer, making the sensor far more practical for long-term use.

This is the link to the Zigbee Temperature and Humidity Sensor so you can purchase it from Amazon.

[https://www.amazon.de/dp/B08L6XZHTY/?tag=glv-21&ascsubtag=9bf732c5-1050-4530-ade7-5b4de2d73c41&th=1&psc=1&linkCode=osi&m=A3JWKAKR8XB7XF](https://www.amazon.de/dp/B08L6XZHTY/?tag=glv-21&ascsubtag=9bf732c5-1050-4530-ade7-5b4de2d73c41&th=1&psc=1&linkCode=osi&m=A3JWKAKR8XB7XF)

And I also bought these battery holders according to these dimensions, and this is the link from Amazon.

[https://www.amazon.de/dp/B07WFX92D2?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1](https://www.amazon.de/dp/B07WFX92D2?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1)

You will also need two M3 heat-set threaded inserts.