RE: Nomadio React 2.4GHz Radio
I don't know if the regulator draws current or not but if you will read through this thread you will find out that the TX although off continues to draw current from the battery & will eventually drain it completely.
The TX uses a small amount off current for saving changes after shutting down or something like that.
If you install a switch between the battery & TX be sure to turn off the TX 1st & only then the installed switch. if you will turn off the installed switch 1st you will lose all the changes made in that session.
It is also important to make sure there is no connection between the battery & TX when not in use since if the battery will be drained to much it might destroy it.