Originally Posted By: Eugene
I like the idea of battery powered too, but when you start having several its a lot of batteries, just like now having to change 4 9v batteries every 6 months. I want to wire everything together with one battery in one place to power them all.


This would be easy if you have access to them via the attic. For people who just want hard wired (non-battery) think about them not-working when the power goes out... or at least buying the ones that take hard wire + a back-up battery.

I believe the ones I got say the battery should last 5 years. I know the yhad some closed units with lithium batts that sthey say last 10.
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