That may not be a bad idea. I’m kind of paranoid though and want to make sure I see regular reports to ensure the device is still connected; 12 hours is probably too long for my comfort zone 
. Maybe once this battery dies, I’ll set it to 2 or 3 hr reporting.
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There’s not a way to tell it to always send both together, but you can adjust the interval so that it’s not as frequent.
People have reported the same thing when using a ST Multi outdoors in the winter. It’s just the nature of the batteries; the voltage is going to droop when they’re exposed to very cold temps. I’ve heard that the Energizer e2 lithiums do pretty well in the cold, FWIW.
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Correct, I use lithium AAs in my outdoor Honeywell temperature sensors and they last upwards of 2 years.
Same for using them in some Acurite sensors I kept on my boat. There I was tracking the high/low temps to get a better idea how the bilge was doing through being in-water over the winter. Air temp in the salon was about the same as outside, bilge stayed right near water temp of 42F (even with a skin of ice on it).
At some point I do want to automate monitoring on the boat, but for now offline stuff works fine.
Definitely look into using lithiums anywhere you’re going to be dealing with low temp extremes.
@mitchp I know this is an older post, but I wanted to let you know…
The zigbee devices can be updated on the fly with the configure button. No need to remove and repair.
I know it works for the iris sensors anyway, not sure about anything else.
I’ve found the Iris devices to be pretty responsive to on-the-fly reconfigures, but not all ZigBee devices are. Particularly those with smaller batteries… (Quirky)
edit: //// Of course no actual correlation to battery size, I’ve just noticed that those sensors which need to be more conservative with their energy use tend to be sleepier.
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It was just vary by manufacturer (not battery size). Some Zigbee devices will accept a configure commanded anytime, others pretty much only process the configure during initial set up. So try it without resetting if that’s easier, but if you can’t get the configured to take, then go through the repairing grasse so try it without resetting if that’s easier, but if you can’t get the configured to take, then go through the repairing process and see if that helps.
Sensors are often the most difficult because they have their own internal connectivity cycle as they are not designed for continuous monitoring. It can be tricky to get that just right in terms of timing when doing a configure.
Hey Jason, how long did you get out of your November battery in the freezer? I just scooped some of these contacts and put one in the freezer and now it’s down to 68% in two weeks. The one outside is down to 88%.
I’m still using the same battery. It’s down to 55%, but no problems so far. I’m thinking since it’s not reporting open and closed, temp only, it’s going to last a while.
You could see 88% The first week you’ve installed a new device, that typically just means “less than 100%”
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OK thanks, I will scoop some more (fridge and beverage cooler) while the price is still cheap. Sounds like a sensor scaling issue, as long as they last it’s OK.
@Whippm
Thought I’d update you again. This same sensor is still kicking along on the same battery. Though, oddly enough it is still reading 55%, but I can’t tell when the last battery check in was done.
It is still reporting temp changes… So that is good.
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That’s great for a freezer! My freezer one has the shortest life, two batteries in 6 months. I was able to move one non working freezer battery to a room temperature contact and has been working another 3 months. 
The reported battery levels are not accurate at all, they seem to be stepped to 88, 77, 66, 55% then dead.
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Update… the battery is still at 55% and still reporting temp.
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I had to repair a contact sensor on my window in my kitchen. It is about 10 to 15 feet away from the one that is in my fridge keeping track of the temperature. I was repairing it, the zigbee lines of communication Must have crossed.
The one in my fridge briefly display the temperature 66°. Which is usually the temperature of the one that I was repairing.
