> For the complete documentation index, see [llms.txt](https://onpoynt-1.gitbook.io/stem-ranger-version-2/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://onpoynt-1.gitbook.io/stem-ranger-version-2/untitled.md).

# Safety

## Warning**: Do not install propellers until just prior to flight!**

## **Ensure propellers are removed during the building process and whenever troubleshooting.**

## Note**:  Ensure the battery is NOT connected if you have the propeller on. Make sure you REMOVE the propellers before connecting the  battery.**