Well, American Power Conversion has battery backup power supplies for computers.
I have an Office UPS350, and it only gives me 3 minutes ot shut down when power goes out.
Well, I just hooked up the replacement Uninterruptible Power Supply to walll current to charge it for use.
It will give me 8 minutes or so before I have to shut down in a power outage.
The new one is HEAVY.
I'm back.