The annoying thing about these sensors is that they are using ER14250 batteries. These are difficult to come by, and as reported elsewhere in the forum, when you do get them, they often don't work. I have the same experience - I have loads of the ER14250 batteries. 80% of them don't work out of the plastic despite testing 3.6V. I've been unable to determine why some batteries work and others don't. If the sensor displays a blue LED when the battery is inserted, the battery is good. If not, throw the battery away.
But I've discovered that normal CR2 (3.0V) batteries work fine. The only issue is that the cover won't close with the CR2 battery, but I don't suppose that is much of a problem for this use case.
I have yet to test how long the CR2 battery lasts, but at least this could be an emergency solution if one can't get hold of the ER1420 battery.
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