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