Well, it’s taken a number of months but the battery in the UPS for my Windows box has finally deteriated to the point that it can no longer power the system. I used to have other devices plugged into it and have been removing them over time as the UPS could no longer handle the load. Addmitedly, I was probably over-taxing it at first — 2.8 GHz P4, 19 in. CRT, HP 1600 Color LaserJet all on a 350 VA UPS.
I went to the APC web site to check for a battery replacement. They had it for $27+tax, plus $7 shipping. They also offered a trade-up program that purported to let you get up to twice the VA at up to a 35% discount. However, most of the reasonable replacements seemed to have little or no discount. Replacing it with the new version of the same model was $39+ts and moving up to 550VA was $56+ts.
I ended up picking up a new 550VA UPS at Fry’s for $70+t. I was going to get one for $60, but I liked the layout of the more expensive one better (lights and button on the side opposite of the power cable). Both were specifically not APC — Belkin instead — though Fry’s had the 550VA APC for $60 as well.