Just a few minutes ago, I was working on my desktop PC (Windows 7 Ultimate) in MS Word 2003, and suddenly the system shut down. It saved the current Windows session to HDD before shutting down, so there was no loss of data. The computer actually shut off, then a second later, turned on again, and Windows resumed. There was a message during the resume that the system had shut down due to low battery alarm. Just as the computer had shut down, I heard a click which probably came from my APC BR-800 battery back up. But there was no loss of AC power at any time. I believe that the UPS performed a battery test, which disconnects the AC and runs the system on battery for a short time. It was during this test that Windows erroneously detected the low battery, despite the fact that the battery information in the task bar said 97% charged. At the time of this failure, the APC utility, Power Chute was not installed. I subsequently installed the software, and now it appears that the system performs properly. During install of the APC Power Chute software, Windows battery monitor is disabled. It does appear that Windows 7 did not interface properly with my battery back up. I ran another self-test of the APC BR-800, and it passed. The unit is only about 6 months old, so I do not suspect any problem with it. Has anyone run into this problem with a UPS? Thanks FW

Hello,This problem may be caused by Windows 7 battery life failures. See this article:Microsoft looking into Windows 7 battery life failureshttp://arstechnica.com/microsoft/news/2010/02/microsoft-looking-into-windows-7-battery-life-failures.arsTry to change the "Low battery level" and "Critical battery level" by opening "Power Options" and see if the issue persists. Thomas77

I recently began experiencing the same issue with my 18-month-old Dell Studio XPS 9100 desktop PC. The PC spontaneously goes into what looks like hibernation mode, then immediately reboots. I'm presented with a black screen warning me that the battery [what battery?] is critically low, and recommends that I should either recharge or replace the battery before using the PC. This screen is replaced with a "Resuming Windows" screen, and after much disk thrashing, Windows resumes where it left off. The PC has done this twice while I was present to witness it; on one of the two occasions, an Internet download that was interrupted resumed as if nothing had happened. That was impressive, anyway. When this issue first appeared, the PC was attached to a several-year-old APC battery back-up. The back-up battery had last been replaced a couple of years before. I have not installed APC's Power Chute software, and rely on Windows to manage power options (which are set to the defaults that come with a Windows install, simply because those settings have worked well over the years). Yesterday, I replaced the battery back-up with a new APC Back-UPS 750. Because of the random nature of the rebooting issue, it's far too early to know whether the new battery back-up will make any difference. The spontaneous rebooting occurs when there are no apparent problems with the electrical power, and seems to happen at random. So far, anyway, I haven't suffered any hardware damage or loss of data due to this glitch, but it's incredibly rude when Windows decides to reboot itself in the middle of a work session. Is this in any way related to the problems I've read about concerning Windows 7's power management related to laptops actually running off battery? Could the interaction between Windows 7 power management and the aging battery back-up have been the culprit? Should I break down and install the APC Power Chute software to circumvent Windows' own power management? Is anyone else seeing the same issue, and have you come up with a solution that works? --Larry