We have a SFR/RED router and ONT. It takes up to 20 mins to connect after the shortest of brown-outs. It needs a UPS and I sort of have one. It's a house battery - see my posts on Victron. However, that won't keep stuff going during a firmware update, or if someone restarts the dbus....
Enter a UPS. The router has a 2A 12V psu. The ONT has a 12V 1A psu. Combined operating current is 1.3A max (15.6W) A Y-lead means you can delete the smaller PSU. That will save a watt or 2 vs 2 mains bricks. Turning off the wifi will save another ~4W (see later post on Asus router as why this matters)
A quick and dirty router consists of a 3S li-on battery scabbed from a very old Dell laptop. Added a 3S protection board and put it in parallel. The battery will have about 80% capacity at 12V. The discharge curve is pretty flat, and I only need protection for maybe 30s if I change supplies over.
The protection board will cut out a 8.1V and it will prevent excessive charge. I'll need to test this otherwise there is a risk the battery will collapse the 12V supply.
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