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In the big event of a blackout an APC 2200 battery, or an APC Smart-UPS 2200 battery, will be able to continue supplying power to one's equipment. Your UPS shifts to this battery power until the regular power supply is rear. Should there be a prolonged power interruption and the battery may not survive that long, it might at least allow the user to save important data before shutting down the hardware. This may also give in order to transfer 1 source currently being generator.