Don, I wouldn't suggest putting 3x the rated voltage into any electronic device, this is way over the spec. I doubt it would handle it. Besides, you get more efficient power from 2xAAA's than you would from a 9v battery, and AAA's are cheaper.
I'm…
I have the same issue with mine, Phone, Laptop etc work from the garage, but TWINE isn't reliable there. Perhaps the TWINE makers can confirm external antenna ability, or give us other hints.
A simple clip with both cable tie mounts, and screw holes would suffice for most people. Let's keep the ideas simple and universal to suit many applications.
I agree, sensor values should be able to be sent upon request using the appropriate string. eg blah blah blah [temp] blah blah [orientation] blah blah [breakout] blah blah [batt voltage] etc etc...