New ups is here and seems to be fine

I just unpacked the new Ups last night and plugged it in immediate. Powered up and seemed to be fully charged already. So I lugged it downstairs and plugged it in. Plugged the monitor I have in the rack and the switch I have setup. Both were fine. So I then unplugged the ups. Both stayed powered and the unit started to beep. I will have to move my network equipment (Cable modem and maybe a wireless router) and the firewall and ipbx. That will put a little more load on the ups. Then I will try the unplug thing and see how long it stays up. Or I could just plugin the freezer that is next to it. See how long that stays cold.