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THat is the model on your furnace.There is not a battery in furnace.If you are referring to thermostat on wall, give me model on thermostat or send me a picture of it.The front pulls off most modern thermostsats
Is this box in the heater closet or on the wall in room?
Can you send me a picture?
If you have a paper clip icon on your page you can attach using that link.Or
You can upload the pictures using the tiny pic site .
Here is a link to the site.
Click on Browse , select the file from your folder.then click UPLOAD NOW.
They will give you a quote to enter in the box to verify you are a human.Enter the quote and click UPLOAD NOW
You will see your picture on right side of screen.
Then copy the link URL for email & IM
Paste that link here on the site.
Do you see a brand or any number on the box you are referring to? I want to help, but we have to identify what the box is.The furnace itself has no battery.