I've refurbished one also. Mine is a APC 1400. It had no output at all in either battery or with the line plugged in. Got it from the IT guys at work. They replaced it without really checking if it could be fixed. They did check the battery and said it was fine. So I took it home, found a bad relay, replaced it (cost $5) and I had a $650 UPS, w/monitoring. Best $5 I ever spent. It powers my entire system, PC, chiller, mini-fridge, 21" monitor, cable modem, router, and I get about 25 min of backup. Winblows even had the driver so I didn't have to go looking for one.
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