Anyone had a smart things motion sensor get stuck on "inactive"?
Had a sensor running for about 6 months but this morning it started not activating. Last log shows the battery at 49%.
Any thoughts? Is the battery indicator often wrong and maybe I have a dead battery?
More then likely the battery has died, some devices report battery better then others. If a replacement battery doesn't do it then you can check other things like your mesh health, but as it has been working for 6 months the battery would be my first thought.
Second vote for a replacement battery. Battery reporting (in most devices, not just these) is notoriously unreliable for multiple reasons (lithium chemistry with nonlinear discharge curve; Zigbee "tiering" of battery levels). I had a different device recently die when it reported 40%, while I've let others hover close to 0% for weeks.
Besides motion, these sensors should also periodically sent temperature reports. You're also likely to see something (for any activity, even if it didn't make an "event"/state change on Hubitat) for "Last Activity At" on the device page. If that's been a while, the battery is probably gone.
Many people use an app like Device Watchdog to track this. I wrote Device Activity Check for myself for a similar purpose. Just something else you can add to your toolbox if interested. 
Thanks all, I'll track down some batteries tomorrow and see if that's the issue....
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