I think the capacity of the AA is so high for this device that I haven’t even seen a drop in either of the two devices a bit in a year and thats through about one full Buffalo NY winter, so its a must. The factory battery didn’t make it in a month in cold. I also use on my garage door sensor which is cold too, no issues.
Both at 100% after a year.
Garage door also packed in a similar electric box at top of door from Home Depot, wrap all in some bubble wrap and add a batt holder for easy swap out, but never swapped out yet. Both cycled muli times a day and at 100%
ECOLINK GARAGE DOOR Z-WAVE TILT SENSOR TILTZWAVE2-ECO is the best zwave detection device on market for under $28.