The run time of the new UPS was 32 minutes with a 32' TV, cable, DVDR, speakers, telephone, clock, etc. and one computer (only the 3.6GHz quadratic core and three HDs), but no monitor. There is a fairly noisy fan which only runs when the AC is off, so I can live with that.
The external battery pack has about twice the capacity of the internals, so it will have about 3x total capacity (~540 WH if I calculate correctly). According to the UPS (shipping) the battery is taking the long route and it probably won't arrive this week.
Air shipping would have cost as much as the product, UPS and batteries are so damned heavy.
I'm thinking about plugging both computers, all the hard drives, and the one monitor into the new UPS with external battery pack. I'm not quite sure if it can handle the maximum load, but it's not like I would be stressing the CPUs on both machines with foldings or using a benchmark at 100% all day. The run time should be fine since I'd only be using one system if the power conked out anyway. Then I'll connect the TV, etc. to the one good APC with the new batteries.