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Not OK with a "needs intervention" solution, but I have see many battery powered air pump that will automatically turn on when electricity goes off and uses D batteries like the one "RKpeterson" mentioned above. https://www.bulkreefsupply.com/rescue-air-usb-battery-powered-dc-air-pump-cobalt-aquatics.html
Appears this is probably the winner if I can figure out a way to elegantly hide the air hose. Good to hear one will be enough. I wasn't sure. This is a lifetime solution unless I lose electricity for more time for me to get home. Something that hasn't happened in over 20+ years of living in my house.
Option 2 is mentioned above and seems to be an elegant solution and will also last will over 8 hours for my application. This is an obvious second choice and still in the running: https://m.fish-street.com/battery-coralbox-powercell-for-backup-jebao-pump-dc-pump Only bad news is, need to buy a new one every few years.
The air pump will work (the Penn-Plax I mentioned is also and "auto-on" solution). However, keep in mind that you'll either have to run a bare tube (a "bubbler"), or replace and airstone at least ever month, possibly sooner, depending on how much algae your system grows. That's primarily why I went with Ecotech's power back-up solution for my larger tanks, and for the smaller tanks I simply put the airpump in place when I'm going to be out of town for a few days and can't intervene in a power outage. I should note that I run an Apex and have short-term power backup on my home router, so I will get a notification if the power's out at my house.