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In the event of a power outage the pump will be powered by the battery. Once line power is restored, the charger will recharge the battery. If there is a failure of the primary pump, the charger will supply power to the pump through the battery if line power is present; otherwise, the battery will take over until the problem has been corrected. The lights on the front panel of the charger indicate the state of system: The red light: Indicates that AC line power is present. The green light: Indic