The description says 2-year battery life... is that what you have found? (plan on using it exclusively via z-wave). I don't have a spare 24V line without running another wire to the furnace (a...
» Read More
The description says 2-year battery life... is that what you have found? (plan on using it exclusively via z-wave). I don't have a spare 24V line without running another wire to the furnace (a pain).
« Show Less
My unit has AA batteries in it, so battery life depends on what quality of battery you buy. I got about a year and a bit because I put in Duracell Coppertop. Maybe the new Lithium will be better for longevity.
I bought this and using with SmartThings, using Duracell CopperTop I got about 4 months before it dropped to 20% from my first set of 4. After a recent firmware update on ST, now I'm getting like 1 month. I don't see anything close to "years" of performance. Probably the only way to get 2 years would be not to use it :)
Do yourself a favor if using this device on battery only. Buy some Lithium batteries (right here on Amazon). The difference is 10 fold in battery life. Lithiums shine in just this sort of low drain environment.
Like another commenter I found that the batteries only lasted a week or so when used in conjunction with Z-wave/SmartThings controller without a "C" wire. When the batteries die the thermostat stops sending any signal to boiler so you better hope it's not below freezing and/or that someone is around to change them. I now have "C" wire connected and all is well so far.
There seems to be a lot of conflicting info here. Battery life is going to depend on: 1) they type of batteries used; and 2) how often the device is polled by the Z-Wave controller (SmartThings, Vera, etc.). Lithium batteries will help. The temperature in a house can't change quickly, so if the controller is polling every 1 min. -- or even every 5 min. -- that's faster than you need. The polling rate can usually be changed, although it may require going into the Advanced settings for the device. I'd go with every 10-15 min. for thermostat.