How long do batteries typically last for wireless door sensors?

Dear strangways,

If you have not read the responses to your original question and are really not a Troll then please be so kind as to use the following link with my complements.

ASA is really not the best place to ask your questions.

For most systems the batteries should last a couple years. Replacing them every two years would be more than prudent.

Wireless alarm systems will also tell you if a sensor's battery is getting low.

The batteries will last 5-7 years depending on how often the doors are opened. Your application sounds like a concrete room with three steel doors with steel frames, as you feel there is no need for motion detection. The batteries must be replaced within 1 week (approx) from the receipt of the low battery signal (self monitoring), as the discharge knee of lithium batteries is very sharp. They will cost you from 1-3 dollars each. I suggest you replace them all at once. I would also consider a motion detector, as a door and a motion detector signal means an entry.

John American Sentry Systems, Inc.

In his original post he only plans on using it when he is home, so motion is just sort of a decoration.

I suspect he wants it just for the room in the basement where he keeps the captives...