Sonoff display temperature sensor battery hack

Sonoff Zigbee Temperature Sensor SNZB-02D (that's the one with the display) battery hack to replace the CR2450 battery with 2xAAA batteries. Uses a new variant of my [CR2450 battery eliminator](https://www.thingiverse.com/thing:6480507) with slightly smaller diameter to fit the SNZB-02D battery holder better.

You also need a 2xAAA battery holder - I used [this one from AliExpress](https://www.aliexpress.com/item/32971916557.html). If yours doesn't have the same dimensions, you can edit the battery hack OpenScad file to adapt the `batt_holder_*` dimensions and print your own version. The battery hack OpenScad file also needs the svg files from the zip to be unpacked in the same directory.

The parts can be printed without supports, I used 10% infill. The battery eliminator needs to be printed upside-down.

Update 2025-05-17: There's also a version of the hack with a hanger.

To assemble:

- Print both STLs.
- Insert two wires into the battery eliminator: One through the vertical holes