Does it have a battery option, to help when there's a power failure? If so, what type battery does it use?
1842725
It uses too much energy to be battery powered. Its an AC motor, not possible to be powered by a DC battery.
1842726
Other answers are correct. Unfortunately when the power goes out, I wake up when the room goes silent. I have a white noise app on my phone that I use sometimes. So if the power goes out for a long period of time, I start up my white noise app.
1704630
The battery is a backup in case of power interruption. From a practical viewpoint you need a low voltage power supply.
480559
The battery is for back-up reserve only, in case of power failure. The system operates with reduced function on battery power only, and is not recommended by the manufacturer.
1981162
It is supposed to be able to work from battery power, so that you can hang it anywhere without a power cord. But mine arrived without the battery option at all. When I questioned this, they said that the battery powered version was not being produced anymore, and they refunded my money without making me return the item.
207487
Doesn't have the battery but somehow it keeps memory for short, 30 min power los. I have checked this feature.
823700
It's been quite awhile since I installed my timer and I don't remember now what number it was----but I know that it did take a back up battery. Are you sure your's does not? I've never seen one that didn't? But I suppose that it's possible that the newer models might use a system that won't dump your settings when the power goes off. I haven't researched your model number so I can't say one way or the other for certain.
2163838
designed only for 120v power supply. no battery backup. in a power outage it would not work.
283537
It does not have a battery. I'm not a computer genius, so I can't tell you how it manages to work without a battery, but I know that it does. No need to worry about replacements :)
1033749
Yes. I purchased it to replace the same battery that was in my home alarm unit. It serves as a back-up power supply in case of a power outage. It works dependably when the electricity fails (that doesn't happen here too often).
580683
Yeah. It take one battery. Good battery it will take more than 8 hour to run out of power.
1667705
I run this from the outlet, and it's been exceptionally reliant. There's a back-up battery for emergency power outage.
1483795
No battery backup as the other responses indicated already. It's worth mentioning that there is some sort of memory function so that it "remembers" the temperature setting when the power does come back on.
1349043
Mine uses only D Batteries, no electricity. It came in very handy during last nights high temperature electric outage.
1500191
Not battery operated. Does have battery backup, in case electricity goes out.
610574
Don't know. I've had this thing for a long while & no sign of battery failure -- works great, don't worry about battery.
548853
No. It does not have battery backup. During a power outage, it will need to be manually disconnected to allow opening or closing of the garage door.
2139588
It's just a backup battery if your power goes out, as far as i know its not just for certain versions of windows.