After reading Dr. Hiller's article, it appears that water circulation is most important and that it doesn't need to be significant. Meaning, a single powerhead is probably enough in the short term 24 hour period. So, using a smaller powerhead, like a jebeo rr-8 on the lowest setting may be fine for the short term of around 24 hours.
How do I calculate how long something like that will run on a battery of x size? Should I look for something with DC or an normal AC plug?
A UPS I suppose will do the trick, but those are approaching $200+ too. I wasn't able to find anything that converts power from a ridgid or ryobi battery to AC or DC...that would be nice. I also have several USB cell phone packs. Can something like that work?
Also, (1) would a big power bank work (say 25,000 mAh), (2) can something like that be connected to a dc plug, (3) how do I determine how long the power bank will last so I can stop asking dumb questions. How can tell whether a jump start battery, or a camping battery pod, will work?
Now I am being cheap. If I am going to by something, it would be nice to have alternative uses other than just a backup power for a pump that happens once ever 4 years.