Quote:
Originally Posted by WingZeroX5
I can't speak for ecobee because I don't have it, I use nest and C wire is supplying 24V from the transformer. Ecobee products have power packs and various installation options, which I am not familiar with.
I'm not arguing anything, your post says "Nest doesn't rely on battery power. It doesn't have one"
I was merely pointing out that no, Nest has an internal battery. If you have a Nest, then you have an internal battery.
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I checked the Ecobee site - it relies on the C wire. The power pack is a way of providing C wire if your existing install doesn't have one, otherwise it must use your existing C wire.
I actually didn't know the Nest had a battery as I guess I've never considered it - it's always been connected to the C wire, and always worked. The battery isn't replaceable as far as I know as there's no battery door or anything. It's a bit more like the BIOS battery in a PC - there, but only noticeable if you leave it powered off for ages and it dies.