The electronics of a UPS do degrade over time. The warranty of the UPS should give an indication; though there are certainly other motivating factors for them wanting you to buy a new one. Too bad there is not a testing and replacement procedure for the internals. It's not like the form factors have changed that much.
Lunar, why not switch the new batteries into the working UPS to test the
? Or buy a used working UPS to match up with them.
All I have ever used are APC. If you don't replace the batteries when the unit tells you to, the entire UPS shuts down in ~30 days. Not much of an Uninterruptable PS
Are you friggin kidding me??
All of ours just turn into a super annoying power conditioner as far as I am aware.