Thanks in advanced. We are doing some generator maintenance at our site. Our Avaya definity G3si switch will be running off of Lucent model 12/10/s1042AU131AE00B UPS for around an hour in the morning and another hour in the late afternoon. Does anyone know how long this UPS can function powering the switch. Also is there any preventive maintenace that should be done on these UPS's? Not sure when they was last serviced.