battery backup vortech

Had a power outage the other night after a rain storm and massive snow melt. Could have been from an underground ballast somewhere blew, (neighbor's hypothesis). I bought a generator several years ago and never used it other than starting it once to see if it worked. Good thing I had it. LIST...

Penn Plax Silent Air® B11 Series Battery Operated Aquarium Air Pump this thing is suppose to only kick in when power is out AUTOMATICALLY. It runs off 2 D batteries and said to work for 7 days in providing oxygen. I am wondering if I got 1 for my 40b and 2 for my 125g if this would work to...