At some future time I'm considering using Z-wave for some heating controls. Having mains powered Z-wave nodes to help with mesh connectivity seems like a good idea, and having alarms where one sensor can set off all the alarms also seems sensible (but not so worthwhile I'm keen to pull new signal wires through).
http://www.fibaro.com/en/system-fibaro/smoke-sensor-en "You can connect the sensor to 12 or 24 VDC adapter if you wish" is going to look a mess, or involve making a large enough hole to tuck a socket and adapter inside the ceiling where now there is just a hole for a cable.
Mains powered alarms with radio interconnects that don't specify a standard and are presumably manufacturer specific are easy to find (and would be easier to set up the networking).
Other battery powered Z-Wave connected alarms exist. http://getvera.com/z-wave-smoke-detectors-brainers/ http://www.uk-automation.co.uk/products/Z%252dWave-Smoke-Detector.html http://www.everspring.com/SF812.aspx
But not, as far as I can find, the combination. Am I missing something?
And if I did switch to battery-only powered alarms, what's the best way to safely and neatly terminate the existing cable without enlarging holes more than necessary, and without sticking junctions boxes on the ceiling?