It's certainly possible - however, it would add cost to an already premium solution. I'll look at what is needed - iirc PoE is 9v at a minimum and this is a 5v solution. So we'd need to step-down the voltage.
It was a joke guys... How about extra RAM?
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I assume that's coming in the C8? 
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You've gotta work pretty hard w/this group to pre-date them.
Grinning and running (w/my walker) and ducking...
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I'm gonna have to put on my "Please Don't Tease the Geeks" t-shirt.
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That's good, a quick bit of research suggests it is not an endeavor we would consider.
However I think as a product a POE splitter with UPS built in would be a neat device.
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Honestly, at that point, I'd just put the PoE source device on a UPS....
Oh, wait... IT ALREADY IS!
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Eufy sells a similar concept UPS for their Homebase 2 camera hub. It is a bit simpler in that it does not communicate its battery state/charge to the hub.
I think this is a great idea for Hubitat too. Thank you for taking the time to create the design. 
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It would be perfect for keeping all my outdoor plugs connected on the Z-Wave mesh until I use them the next Christmas. Only HALF joking... may have to look at one of their 22 outlet models...
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I think if this could be reasonably designed and if you add a radio(s) and you pay the FCC fee, this could be sold at a reasonable price for a profit. I mean lets say $99.00 usd. more than 1 usb output. Zigbee... Even though it was only a joke from @bravenel a version with poe that is simply for power conversion to either usb-c or micro. Just a thought. Might be enough to cover the cost in the hobbiest market of not just HE but one or 2 others.
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Kind what I have - my router and POE Switch are on a pretty good UPS, and my HE on a POE splitter - but doesn't do auto shut down of HE when battery runs down. Does run a pretty long time though, so hopefully I get to it. Watching this project.
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A fire waiting to happen !
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I looked at POE. Because the Ethernet signal has to be handled it becomes a much more in depth device than we are willing to take on. Besides you can get a POE splitter for around $15 from TPLink.
Radio: What you suggest the radio do? I would think the only benefit would be to tell the HUB the mains was lost, and there are plenty of alternatives. Since I would guess this UPS will be within a few feet of the Hub, I don't see a router function being useful.
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What is?
That was the reference to the 66 AC outlet power strip.
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Oh yeah, reminded me of all the 3-way into 3-way into 3-way for the Christmas lights in National Lampoon's Christmas Vacation.
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I was thinking zigbee to show switching from mains to battery as a trigger. Maybe show battery levels.
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Having a dry contact relay open when power is lost, one could use any contact sensor you'd want to indicate power status. Simple.
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Power source is fairly easy, but I don’t think there’s an easy way to get DoD to a Zigbee radio.
I am still quite partial to the idea, but adding another $12 USD to a ~$60 device, not including batteries, is something we are finding hard to justify.
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