An update: After getting the announcement from Supermechanical about vibration sensing now being available, I decided to give it another try.
I put new Duracell batteries in, and set up a vibration rule, to log triggers to a database. I left the Tw…
I'm sorry to say, mine seems like a battery-killer so far, even while only monitoring temperature. I put new batteries in, and less than a week later I got the "Low batteries!" auto email. It was around 2.8V at that time.