Despite the caveats mentioned above, many people do it, uating a deep cycle marine battery. Car batteries are designed to price a lot of power for a few seconds to start a car. Boat batteries are designed for longer use. You should make sure the battery is fully charged before connecting it so the UPS doesn't have to charge that big battery, just keep it charged.
You should have a fuse installed at the battery terminal and use a battery box with a small fan added to catch any leakage while dissipating any fumes.
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